I just spent 2 days working with this exact problem.
We had our model fully constrained, but our geometry was not correct. Algor does not like elements runing into other elements where there is not an endpoint.
Try constraining first, but if it does not work.
Start looking to change a few...
My model is 3-D Beam.
I have tried multiple layers & groups.
I have edited beam properties.
I now have 1 layer and 6 groups with different properties.
I am constantly getting the error: cannot match material indices
What is this error? How do I fix it?