how i fix this Regeneration error in pro e 2 assembly. ?

i just make some assembly in proE 2 and then i save as (save a copy) in one folder, after some time i just open that file for another use. then it shows a regeneration error.
this error only happens only in .asm files, not for .iges file.
can anyone help me ?

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I think one of the component is missing from copy location. Insted of saving it as copy, try doing Backup option ; hence all parts and assembly file saved in same location.

 
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