Ok, I realized that I had to give the element 0 because it is an array. So
with this I don't get any errors now:
matList = [18, 24, 7, 0,
54, 17, 1, 0,
22, 34, 8, 0,
11, 78, 6, 1]
mScr = OpenMaya.MScriptUtil()
MMat = OpenMaya.MMatrix()
mScr.createMatrixFromList(matList, MMat)
cmds.joint(n="myJoint")
mslist = OpenMaya.MSelectionList()
mslist.add("myJoint")
mobj = OpenMaya.MObject()
mslist.getDependNode(0, mobj)
mfndepnode = OpenMaya.MFnDependencyNode(mobj)
mfndepnode = OpenMaya.MFnDependencyNode(mobj)
matPlug = mfndepnode.findPlug("worldMatrix")
matPlug_ind0 = matPlug.elementByLogicalIndex(0)
mfnMatData = OpenMaya.MFnMatrixData(matPlug_ind0.asMObject())
mfnMatData.set(MMat) # No errors, but nothing is happening
..but still, the method .set() is not doing anything. Not sure why...
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