This issue occurs mainly due to security related issues. Follow the steps below in order to rectify the issue:
In Visual Studio, go to the Control Flow Tab
Right-click on an empty area inside the window, select properties.
Set Protection Level to EncryptSensitiveWithPassword
Set PackagePassword to “myPassword”
From the Connection Managers:
Double click connection
Click “All”
Under Security Area:
Set Password to your connection’s password ...(read more)
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