Fatal error: Cannot redeclare class UserAttributeKey in /concrete/models/user_attributes.php on line 326
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Get error message "Fatal error: Cannot redeclare class UserAttributeKey in /home1/soltrekk/public_html/C5/concrete/models/user_attributes.php on line 326" when going to "Users and Groups" from the Dashboard. Just upgraded to 5.4.1.1

DO you have any custom User attributes? are you running any packages from the marketplace?
I have downloaded but not in use apps from the marketplace. None of them are in use in the site. As far a custom attributes I don't have any. There are only 3 users Admin, regular user, and Fam. Fam users have access to one page that regular users do not. That's about it with custom attributes.
I don't know what's wrong with the site.
I get this: Fatal error: "Cannot make static method AttributeKey::getList() non static in class FileAttributeKey in /home1/soltrekk/public_html/C5/concrete/models/file_attributes.php on line 241." When I go to "Files" from the Dashboard.
I get this: "Fatal error: Cannot redeclare class UserAttributeKey in /home1/soltrekk/public_html/C5/concrete/models/user_attributes.php on line 326." When I go to Users & Groups" from the dashboard.
And I get this: "Fatal error: Cannot make static method AttributeKey::getList() non static in class CollectionAttributeKey in /home1/soltrekk/public_html/C5/concrete/models/collection_attributes.php on line 193." When I go to "Add Functionality" from the Dashboard.
I get this: Fatal error: "Cannot make static method AttributeKey::getList() non static in class FileAttributeKey in /home1/soltrekk/public_html/C5/concrete/models/file_attributes.php on line 241." When I go to "Files" from the Dashboard.
I get this: "Fatal error: Cannot redeclare class UserAttributeKey in /home1/soltrekk/public_html/C5/concrete/models/user_attributes.php on line 326." When I go to Users & Groups" from the dashboard.
And I get this: "Fatal error: Cannot make static method AttributeKey::getList() non static in class CollectionAttributeKey in /home1/soltrekk/public_html/C5/concrete/models/collection_attributes.php on line 193." When I go to "Add Functionality" from the Dashboard.