SSIS - Problems while executing package from SQL Server Agent Job

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After being an active member for more than 2 years on Stackoverflow.com, I can say that one of the most popular SSIS problems is that the Package was executed successfully from Visual Studio but it encountered an error while being executed from SQL Server Agent Job.
When SSIS packages are executed from SQL Server they access File System using the SQL Server Service Account NT SERVICE\MSSQL$<Instance Name> (Where <Instance Name> should be replaced by the installed instance name). You have to Grant this account to access the selected directories or run the SQL job using a proxy account.
You can refer to the following link for a step-by-step guide for each suggestion:
SQL Server Serivce account Permissions:
Setting proxy account:

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