Adding attachments to outlook - "Run-time error 91: Object variable or With block variable

What is wrong with my code? I received "Run-time error 91: Object variable or With block variable not set". My source_file is able to get the correct file location as string but the my_attachments just shows nothing in the locals. The source_file shows 2 locations:

C:\Users\User\Desktop\test.txt; C:\Users\User\Desktop\test2.txt

Locals.JPG

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I'm not sure you need the my_attachments object. Just pass the source_file to a string parameter.

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Thanks. It works.