Im getting that error when try to call a __doPostBack on one of my pages, every page that i have in the project use __doPostBack function but in this particular page im getting that Javascript error.
i was looking in the internet and the only thing i read is that this error happends when i have a unclose tag but i review the site and its ok.
Error: __doPostBack is not defined Source File: htt://localhost:99/ProjectName/Disable.aspx Line: 1