Problems to simulate MSL models with OM nightly

[Christian Kral <dr.christian.kral@…>]

Im am using the following version of OM nightly und Linux Mint 19.2:

Connected to OpenModelica 1.16.0~dev-72-gc3a557c
Connected to OMSimulator unknown-linux

However, I have a lot of difficulties to run OM simulations currently, but I cannot say whether this is the installation on my machine (which I guess is the case) or the actual OpenModelica version. After I noticed some problems a week ago, I re-installed everything (through Synaptic) but that did not change anything. Please let me step-by-step explain what I notice:

1) Start of OMEdit

I get the following messages:

[1] 20:18:35 Scripting Notification
Skipped loading package Complex (3.2.3,default) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/ (uses-annotation may be wrong).

[2] 20:18:35 Scripting Notification
Skipped loading package ModelicaServices (3.2.3,default) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/ (uses-annotation may be wrong).

[3] 20:18:35 Scripting Error
Failed to load package ModelicaReference (3.2.3) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/.

I go to the indicated directory omlibrary and see all the installed libraries:

christian@Yogix:/> 
christian@Yogix:/> cd /usr/bin/../lib/omlibrary
christian@Yogix:omlibrary> ls
'Buildings 5.1.0'                 OpenBLDC
'ElectroMechanicalDrives 2.2.0'  'PhotoVoltaics 1.5.0'
'EMOTH 1.4.0'                    'PhotoVoltaics_TGM 1.5.0'
 GNU_ScientificLibrary           'PlanarMechanics 1.4.1'
'HanserModelica 1.1.0'            PlanarMechanicsTest
'KeyWordIO 0.9.0'                'PowerFlow 0.3'
'Modelica 3.1'                    PraxisSimulationstechnik
'Modelica 3.2.1'                 'PVSystems 0.6.3'
'Modelica 3.2.2'                 'SiemensPower 2.2'
'Modelica 3.2.3'                 'Spot 0.706.1'
'ModelicaTest 3.2.1'             'SpotExamples 0.706.1'
'ModelicaTest 3.2.2'             'SystemDynamics 2.1'
'ModelicaTest 3.2.3'             'VehicleInterfaces 1.2.4'
'ModelicaTest trunk'             'WindPowerPlants 1.3.0'
'Modelica trunk'                 'XogenyTest 1.1'

2) I try a simple Model

model Test
  Real x(start = 1);
equation
  der(x) = -x;
end Test;

This model simulates OK with no complaints.

3) I simulate Modelica.Blocks.Examples.Filter

When I try to simulate this model I get asked to switch back the old frontend and then the following error messages occur in the Messages Browser:

[1] 20:25:59 Scripting Notification
Skipped loading package Complex (3.2.3,default) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/ (uses-annotation may be wrong).

[2] 20:25:59 Scripting Notification
Skipped loading package ModelicaServices (3.2.3,default) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/ (uses-annotation may be wrong).

[3] 20:25:59 Translation Error
[Modelica.Constants: 25:3-26:101]: Variable ModelicaServices.Machine.Integer_inf not found in scope Constants.

[4] 20:25:59 Translation Error
[Modelica.Blocks.Continuous: 2271:9-2271:37]: Import Modelica.Constants.pi not found in scope <top>.

[5] 20:25:59 Translation Error
[Modelica.Blocks.Continuous: 2293:11-2293:73]: Variable pi not found in scope Butterworth.

[6] 20:26:08 Scripting Notification
Skipped loading package Complex (3.2.3,default) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/ (uses-annotation may be wrong).

[7] 20:26:08 Scripting Notification
Skipped loading package ModelicaServices (3.2.3,default) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/ (uses-annotation may be wrong).

[8] 20:26:08 Translation Error
[Modelica.Blocks.Continuous: 2410:9-2411:40]: Variable .Modelica.Constants.pi not found in scope Modelica.Blocks.Continuous.Internal.Filter.coefficients.lowPass.

[9] 20:26:08 Translation Error
[Modelica.Constants: 19:3-20:47]: Variable ModelicaServices.Machine.eps not found in scope Modelica.Constants.

[10] 20:26:08 Translation Error
[Modelica.Blocks.Continuous: 2446:9-2447:40]: Variable .Modelica.Constants.pi not found in scope Modelica.Blocks.Continuous.Internal.Filter.coefficients.highPass.

[11] 20:26:08 Translation Error
Error occurred while flattening model Modelica.Blocks.Examples.Filter

So this model does neither compile nor simulate.

---

So it seems there is a problem with loading and/or treating the Modelica Standard Library correctly.

• Could anyone on a Linux machine please confirm / not confirm my findings?
• Any ideas what could have gone wrong?
• Could that have been caused by installing some other software?

[Christian Kral <dr.christian.kral@…>]

I just wonder where omlib-modelicaservices shall be located.

Trying

sudo apt remove omlib-modelicaservices-3.2.3
sudo apt isntall omlib-modelicaservices-3.2.3
sudo apt install omlib-modelica-3.2.3

I simulate Modelica.Blocks.Examples.Filter now and it goes all OK.

Any idea what could have gone wrong here? Why disappeared the ModelicaServices?

[Christian Kral <dr.christian.kral@…>]

I would like to wait for some comment from the OM support team here. If there isn't anything to add, we can close this ticket.

[Christian Kral <dr.christian.kral@…>]

Even Complex was missing: Now after removing and re-installing everything I see:

christian@Yogix:omlibrary> ls
'Buildings 5.0.1'                'ModelicaServices 3.2.2'
'Buildings 5.1.0'                'ModelicaServices 3.2.3'
'Complex 3.2.1.mo'               'ModelicaServices trunk'
'Complex 3.2.2.mo'               'Modelica trunk'
'Complex 3.2.3.mo'               'NcDataReader2 2.5.0'
'Complex trunk.mo'               'PhotoVoltaics 1.5.0'
'DriveControl 3.1.0'             'PhotoVoltaics_TGM 1.5.0'
'ElectroMechanicalDrives 2.2.0'  'PlanarMechanics 1.4.1'
'EMOTH 1.4.0'                     PlanarMechanicsTest
 GNU_ScientificLibrary            PraxisSimulationstechnik
'HanserModelica 1.1.0'           'SiemensPower 2.2'
'KeyWordIO 0.9.0'                'Spot 0.706.1'
'Modelica 3.1'                   'SpotExamples 0.706.1'
'Modelica 3.2.1'                 'VehicleInterfaces 1.2.4'
'Modelica 3.2.2'                 'WindPowerPlants 1.3.0'
'Modelica 3.2.3'                 'XogenyTest 1.1'
'ModelicaServices 3.2.1'

Everything seems to work OK after manually re-installing the libraries. However, there is still the following message left after starting OMEdit:

[1] 21:09:34 Scripting Error
Failed to load package ModelicaReference (3.2.3) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/.

[Adrian Pop]

You are still missing some, for sure omlib-modelicareference:

@dev:/usr/lib/omlibrary# ls
 ADGenKinetics.mo                       'ModelicaReference trunk'
 ADMSL                                  'ModelicaServices 1.0'
'Annex60 0.1'                           'ModelicaServices 3.2.1'
'BioChem 1.0.1'                         'ModelicaServices 3.2.3'
 BondGraph.mo                           'ModelicaServices trunk'
'BondLib 2.3'                           'Modelica_StateGraph2 2.0.2'
'BrineProp 0.4.1'                       'Modelica_Synchronous 0.92'
'Buildings 2.1.0'                       'ModelicaTest 3.2.1'
'Buildings latest'                      'ModelicaTest trunk'
'Complex 3.2.1.mo'                      'Modelica trunk'
'Complex 3.2.3.mo'                       MotorcycleDynamics
 ComplexLib.mo                           NcDataReader2
'Complex trunk.mo'                      'NeuralNetwork 1.0'
 ConPNlib                               'ObjectStab 1.1 Dev'
'DESLib 1.6.1'                           ObsoleteModelica3.mo
'ExtendedPetriNets 1.0'                  OpenBLDC
'ExternData 1.0.3-dev'                  'OpenHydraulics 1.0'
'FastBuildings 0.0'                     'Physiolibrary 2.3.1alpha'
'FaultTriggering 0.5.0'                 'PlanarMechanics 1.4.0 Development Version'
'FCSys 0.2.6'                           'PNlib 1.1'
 FCSysTest                              'PowerFlow 0.3'
 FuzzyControl                           'PowerSystems 0.4.0'
 HelmholtzMedia                         'PowerSystems latest'
'IdealizedContact 0.2.0'                 PraxisSimulationstechnik
'IndustrialControlSystems 1'             QCalc
 InstantaneousSymmetricalComponents.mo   QCalcTests
'LinearMPC 1.mo'                        'QSSFluidFlow 1.0'
'MessagePack 0.1'                       'RealTimeCoordinationLibrary 1.0.2'
'Modelica 1.6'                          'ScalableTestSuite 1.0.0'
'Modelica 2.2.2'                        'Servomechanisms 1.0'
'Modelica 3.1'                          'SiemensPower 2.1 beta'
'Modelica 3.2.1'                        'SiemensPower 2.2'
'Modelica 3.2.3'                        'SiemensPower OMCtest'
'ModelicaAdditions 1.5'                 'Spot 0.706.1'
 ModelicaByExample                      'SpotExamples 0.706.1'
'ModelicaCompliance 3.2'                'SystemDynamics 2.1'
'Modelica_DeviceDrivers 1.4.0-dev'      'ThermoPower 3.1'
'ModelicaDEVS 1.mo'                     'ThermoSysPro 3.0'
'Modelica_EnergyStorages 3.2.1.mo'      'ThermoSysPro 3.1'
'Modelica_LinearSystems2 2.4'           'VehicleInterfaces 1.2.2'
'Modelica_Noise 1.0 Beta.1'             'WasteWater 2.1.0'
 ModelicaReference                      'XogenyTest 1.1'

You get that message because OMEdit loads ModelicaReference on startup. You can disable that via OMEdit->Tools->Options->Libraries.

[Francesco Casella]

@Christian, are you compiling from sources or using the nightly builds? The nightlies have not been updated since Dec 3.

[Francesco Casella]

See also #5347.

@sjoelund.se proposes to solve this issue with a new Modelica package manager. I agree with that, but we do need a short term solution to avoid the kind of issues Christian is experiencing.

[Martin Sjölund]

Well, I think the packages use recommends for some dependencies, so it's possible to uninstall some packages and not have them reinstalled when you upgrade omc/omedit...

[Christian Kral <dr.christian.kral@…>]

Replying to casella:

@Christian, are you compiling from sources or using the nightly builds? The nightlies have not been updated since Dec 3.

I am not compiling from sources, I am using the nightly builds.

[Francesco Casella]

@christiankral, @sjoelund has implemented a new package manager, which is available in 1.16.0-dev.03 and in the forthcoming 1.16.0 release. It is documented ​here.

Would you mind giving it a look and reporting if it solves your problems?

Currently this tool is command-line only, but we plan to integrate it in OMEdit in the next 1.17.0 release.

[Christian Kral <dr.christian.kral@…>]

I just updated one of my computers to Linux Mint 20. I thus had the chance to perform a "new" installation of OpenModelica. I am currently running:

Connected to OpenModelica 1.16.0~dev-548-gd3091d6
Connected to OMSimulator unknown-linux

I installed the following libraries:

> cd /usr/bin/../lib/omlibrary
> ls
'Buildings 6.0.0'                'ModelicaServices 3.2.3'
'Complex 3.2.3.mo'               'NcDataReader2 2.5.0'
'ElectroMechanicalDrives 2.2.0'  'PhotoVoltaics 1.6.0'
 GNU_ScientificLibrary           'PhotoVoltaics_TGM 1.6.0'
'HanserModelica 1.1.0'           'PowerGrids 1.0.0'
'KeyWordIO 0.9.0'                'PowerSystems 1.0.0'
'Modelica 3.2.3'                 'VehicleInterfaces 1.2.5'
'ModelicaByExample 0.5.0'        'WindPowerPlants 1.2.0'
 ModelicaReference

So the following libraries are installed (see also attached "installed.png"):

• Modelica 3.2.3
• ModelicaReference
• ModelicaServices 3.2.3
• Complex 3.2.3

After starting OpenModelica I get the following messages:

[1] 22:02:59 Scripting Notification
DSvgRenderer::load: XML parse error: error code=99 (3) in (null):7:35: xmlns:ns1: '&ns_ai;' is not a valid URI DSvgRenderer::load: XML parse error: error code=99 (3) in (null):7:35: xmlns:ns1: '&ns_ai;' is not a valid URI qt5ct: D-Bus system tray: no
qt5ct: D-Bus global menu: no

[2] 22:03:00 Scripting Notification
You can install the requested package using one of the commands:
  installPackage(ModelicaReference, "3.2.3+maint.om", exactMatch=true)
  installPackage(ModelicaReference, "3.2.3", exactMatch=false)
  installPackage(ModelicaReference, "3.2.3", exactMatch=false).

[3] 22:03:00 Scripting Error
Failed to load package ModelicaReference (3.2.3) using MODELICAPATH /usr/bin/../lib/omlibrary:/home/christian/.openmodelica/libraries/.

[Christian Kral <dr.christian.kral@…>]

Modelica libraries installed under Linux Mint 20

[Christian Kral <dr.christian.kral@…>]

After following the recommendation of using the package manager (even though a similar version seems to be installed), using

>> installPackage(ModelicaReference, "3.2.3", exactMatch=false)
true

The issue with ModelicaReference disappears. Then only the following message remains:

[1] 22:11:38 Scripting Notification
DSvgRenderer::load: XML parse error: error code=99 (3) in (null):7:35: xmlns:ns1: '&ns_ai;' is not a valid URI DSvgRenderer::load: XML parse error: error code=99 (3) in (null):7:35: xmlns:ns1: '&ns_ai;' is not a valid URI qt5ct: D-Bus system tray: no
qt5ct: D-Bus global menu: no

as the "missing" library is installed:

> cd ~/.openmodelica/libraries/
> ls
 index.json  'ModelicaReference 3.2.3+maint.om'

So yes, this solves my issue (even though I do not understand why "omlib-modelicareference" from the Linux Mint package manager does not provide / install the required package "ModelicaReference 3.2.3+maint.om" installed by the OM package manager).

[Francesco Casella]

Thank for the report! @sjoelund needs to look into that, but he's currently on vacation