@Iresha_Imali Please, add more information, so we can understand what kind of error it is. - What kind of functionality are you using? - When do you get this? What are the steps? Please,add as much details as you can.
It seems that you are working with a Qlik Sense app containing many extensions. The extensions are not visible because they have not been imported. Please, start importing the extensions you need in the app. Ensure that the functionality you are using supports extensions.
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