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Sometimes after installing Magento extension, you will see the Magento error 404 page not found error in your Magento Admin Panel like that:
You can easily fix this error by resetting the permission role of your administrator:
Step 1: Login your Magento Admin Panel
Step 2: Go to Systems >> Permission >> Roles
Step 3: Choose the "Role name" you want to edit, here I pick "administrators"
Step 4: Pick "Role Resource " Tab and change "Resource Access" to "All"
And don't forget to clear Magento cache after this.