Thank you for the question.
The issue you are experiencing is usually caused by modifications made to some of the modules installed on your platform.
However, in order to be precise and assist you further we would need to check the application you are using and try to find out what is the actual cause of the error.
If you are a customer of TMDHosting we recommend you to submit a new support ticket, so our Technical Support Team would be able to revise the script and provide you with more information on the matter.
Alternatively, if your website is hosted somewhere else you should contact the support team of your hosting provider and ask them to assist you.