We are using Zoho CRM to build an application.

Here we have some custom fields in Contacts, Accounts and other Standard and Custom modules. 

Here I have created a new module and also added some fields in this. 
Then I click on Save button. But it is not saving the page layout and giving a very strange error message. 
that is 

What is this? 

I don't get any error like this before. 
So please help us.
Thanks