Why am I getting the error code 18 from my Google Play Store for certain applications?

[AC Question]

I am getting error code 18 from Google play for certain applications.

I have a rooted device and accidentally changed the default installation directory to sd card using lucky patcher. That's what is causing the problem. I set it to auto still the same problem is there.
Please tell me what to do.
Thanks in advance.

 

[B. Diddy]

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