Problem during a motion study

Hello

I am doing a motion study of an assembly on Solidworks 2015.

When I start the calculations and simulation, the assembly makes the desired movement.
However, some keys are red, which corresponds to a position that is not possible to reach, and the images of the keys immediately before and after these red keys are green (not red, which would correspond to an error in the Motion solver).

Do you have any idea why Solidworks says that these are positions that are impossible to reach even though they are in the simulation? Where can I get an error message to correct my motion study?

Thank you

Kind regards

 

Two links that talk about it:

https://forum.solidworks.com/thread/32675

https://forum.solidworks.com/thread/68701

https://forum.solidworks.com/thread/55292

 

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Thanks for the links!

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