How to correct the below error.

Installed one app, but its not able to run. we uninstall the app. after uninstall this error showing while opening sales invoice.
How to correct the below error.

Installed one app, but its not able to run. we uninstall the app. after uninstall this error showing while opening sales invoice.
Try to go at ‘Custom Field’ Doctype, search for that fieldname and Delete
Please check this