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Uncaught ReferenceError: Ext is not defined
I want to use extjs in visualforce but i am getting error Uncaught ReferenceError: Ext is not defined i also added all library related to ext js but this time also getting same error so How to solve this error. I have a urgent requirement to solve this issue .
Could you post the code, then it will give more clerity to your question.
This sounds like the mechanism that you are using to add ExtJS isn't working as expected. Are you pulling this in from a CDN or directly via a static resource? If you look at the web console do you see any errors that the resource couldn't be loaded?

What was the solution of this issue @ravikant . I am facing the same issue .