Error - Failed execution - Flux

Hi, 

When solving my model in Flux 12.3, simple electrical steel strip in a coil, I get at error at the end of solving saying 'Failed Execution'. Under the advanced tab it says the following twice. 'CVCM3M - Sentence too long'. 

Does anyone know what that means? 

The model seems to solve correctly I have the flux density and voltage in my coils I would expect but why does flux then say there is an error? 

Any help with the confusing issue is much appreciated! 

Thanks, 
Ben