Something wrong when I wanna install an app

New Member
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Hello. I wanna install an app for my e-commerce. But, suddenly appear notification like this:

"Oauth error invalid_request: Your account does not have permission to grant the requested access for this app. You may be able to resolve this issue by installing the app as the account owner"

I ask to my leader about this. But she said that she has grant an access for me. So, what does it mean?