“Sorry, you are not allowed to access this page.”

If you receive this error when attempting to access Wicked Block Builder in your WordPress admin, it means the current role doesn’t have the “edit_blocks” permission/capability.  Try deactivating and reactivating the plugin.  If that doesn’t work, ensure that any permission-type plugins are configured so that the current role has the “edit_blocks” capability assigned.  If that still doesn’t solve the issue, deactivate all plugins, reactivate Wicked Block Builder, then reactivate plugins one-at-a-time to determine which plugin is causing the error.