id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
5056	Issue with MultiBody models in the NF	Francesco Casella	somebody	"After @adrpo's commits for overconstrained connectors, the MultiBody examples all flatten and produce a balanced system of equations. Howevver, there are still problems that prevents them to run. 

Please check [https://libraries.openmodelica.org/branches/newInst/Modelica_trunk/files/Modelica_trunk_Modelica.Mechanics.MultiBody.Examples.Constraints.UniversalConstraint.err Modelica.Mechanics.MultiBody.Examples.Constraints.UniversalConstraint]. The following error is reported:
{{{
[/var/lib/hudson/slave/workspace/OpenModelica_TEST_LIBS/OpenModelica/OMCompiler/Compiler/BackEnd/Differentiate.mo:402:3-402:155:writable] Error: Derivative of expression ""joint.revolute_b.R_rel.T[1,2] = (matrix({1.0, 0.0, 0.0}) * transpose(matrix({1.0, 0.0, 0.0})))[1, 2] - (matrix({1.0, 0.0, 0.0}) * transpose(matrix({1.0, 0.0, 0.0})))[1, 2] * cos(joint.phi_b)"" w.r.t. ""time"" is non-existent.
[/var/lib/hudson/slave/workspace/OpenModelica_TEST_LIBS/OpenModelica/OMCompiler/build/lib/omlibrary/Modelica trunk/Mechanics/MultiBody/Joints.mo:306:7-306:60:writable] Error: Internal error 
Differentiate.differentiateEquationTime failed for joint.revolute_b.R_rel.T[1,2] = (matrix({1.0, 0.0, 0.0}) * transpose(matrix({1.0, 0.0, 0.0})))[1, 2] - (matrix({1.0, 0.0, 0.0}) * transpose(matrix({1.0, 0.0, 0.0})))[1, 2] * cos(joint.phi_b)
Error: Internal error - IndexReduction.pantelidesIndexReduction1 failed! Use -d=bltdump to get more information.
}}}
Please identify and correct the root cause of the problem."	defect	new	high	2.0.0	*unknown*