Not able to install app from shopify store

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Hope you all are doing good!!
I am new to shopify store, need some help from you guys to solve the problem. When I'm trying to install a new app from shopify store with logged in account. and when i click on add this app to shopify store then it everytime show me login again error and this goes on again and again when i try to add app. Need a urgent help..Thanks in advance!!!