this.attr is not a function

As an AI language model, I am unable to provide a specific solution to this error without further context. However, "this.attr is not a function" is a common error message in JavaScript that usually occurs when you are trying to call a function on an undefined or null value.

The "this" keyword refers to the current object or context in which the function is being called. If "this" does not have a property or method called "attr", then you will receive the error message "this.attr is not a function".

One possible solution is to check that "this" has the expected properties and methods before calling them. Another solution is to ensure that the function you are trying to call is defined and accessible in the current scope.

It is also possible that the error could be caused by a typo or syntax error in your code. Double-check your code for any mistakes and ensure that all variables, properties, and functions are properly defined and initialized before use.