Maybe, your question was already answered. Please see the following list generated from our Issues after updates page.
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Clear your cache
Refresh your website’s and personal browser cache and reload the page with the issue.
Check if the plugin is enabled
Please check in the Plugins menu if the plugin is still enabled. Plugins can disable automatically if they were previously installed in a different directory.
Critical issues where something is “not found”, “missing”, or “not defined”, are normally resolved by removing the plugin and installing it from the zip file again.
If the issue you are experiencing is not resolved with the answers linked above then please use the Other issues form to send us further details.