vb.net - ".accdb" has become corrupted -

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my program works fine inserting stuff in .accdb file, updating etc. working until add field in .accdb type "calculated field" whenever program can no longer open .accdb. it's throwing error database has become corrupted.
happens adding field in database, without changing coding in program.
has come around issue? there way fix it?

i'm inserting "column1","column2","column3","column4","column5" , sixth column has calculated field column1 + column2 etc.


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