Import from vb4 error abstract.php

[tucarb]

I purchased Xenforo and set up a local site to test the import from vbulletin 4.

Upon starting the import I keep getting this message.

XF\Db\InvalidQueryException: MySQL statement prepare error [1176]: Key 'PRIMARY' doesn't exist in table 'admin' in src/XF/Db/AbstractStatement.php at line 230

I've redownloaded and reinstalled both Xenforo and the add on importer but keep getting this error.

Any ideas?
Import from vb4 error abstract.php

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