Survey builder app error

Dear All, I have added Survey buidler to my apps and opened it in the Modeler and trying to create a Survey, I have mentioned the questions and saved it. But when I reopen the questions are not getting displayed (displaying blank line). On a sepparate note, attempted to open the app in the browser from my app store but received the following error, please help-- 404 Not Found: Requested route ('') does not exist.    
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