Catia: Ignored constraint: the system of constraints is inconsistent or over-constrained

hello everyone,i really need your help.
so i downloaded product from my uni web site which consist of fixed part and a part that can move. when i use constraint that requires second part to move,i get the error from the title. the thing is when i did this in my uni on their computer this didnt happen. and i have the same version of catia as them.
i hope you understand what i0m asking,
thank you!