Why shell permission declined

I don’t know why not working

You can’t access the private data directory of another app (in this case, com.main)

com.main my application package name

What is the purpose / aim? What should be achieved?

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I try to execute cpp file using shell command
But showing permission decline

com.main is my application package name

/data/data/com.main/files/ is root path

I already grant chmod 777 permission

Is your device rooted?
Maybe this will only work with a rooted device.