Problem with the CFD mesh
 

Hello, I created a complex geometry, it has a lot of curves and straight edges and things like that, when I try to create the default mesh for fluent at Workbench it gives me an error, but I can create the default mesh for Mechanic, Electromagnetic, and Explicit can someone tell me why is this happening? It will be very helpful, thanks.

What is the error message?

Actually I do not remember if there is an explicit error but I can say that I left the computer a whole day generating the mesh and was not able to generate anything (I think that it is important to say that I tested this computer creating a 8-9 million elements mesh refining the mesh 3 times and it took around 4 hours) right now is meshing and as soon as I can i will try to generate the Fluent mesh and see if it gives me an explicit error

This is the error that i get from the workbench (Not at the mesh window but at the project window) An unexpected error has occurred: Collection was modified; enumeration operation may not execute.