You are getting this error 35012 due to a corrupted object, such as a form, in your database.
To resolve this error message, follow these steps:

1. Create a new Microsoft Access database.

2. On the File menu, point to Get External Data, and then click Import. Import
   all database objects (tables, queries, forms, reports, macros, and modules)
   into the new database.

3. If you receive the “Unexpected error 35012” error message when you import a
   specific database object, repeat step 2, but exclude that object and restore
   the damaged object from a good backup.

Hope this works!