The account you specified as your WordPress admin account does not appear to be an administrator.

I'm trying to install the wordpress converge module and I can't get past the second step
The module checks the things that it needs at first and all pass, then it asks for the account information.
I put in all the info correctly and I get the following error at the top of the page

Warning: array_key_exists() [function.array-key-exists]: The second argument should be either an array or an object in /home/glasto4/public_html/wp/module_installer/module/appFramework.php on line 56

Then in the settings box I get this error at the same time

The account you specified as your WordPress admin account does not appear to be an administrator.

I thought that it was maybe because I had deleted the original admin account and added my own (as the admin account was set up by an installer and it is recommended to delete it) so I tried a complete new install of wordpress and tried to install the module without doing anything at all to wordpress and still got the same error

with further testing I have found that the error is because the database table prefix is not wp_

How do I correct this?