'gradle sync Error "cvc-complex-type.2.4.a:"

I have installed the latest android studio and I try to sync an old project that I download from GitHub and I get this Error:

cvc-complex-type.2.4.a: Invalid content was found starting with element 'base-extension'. One of '{codename, tag}' is expected.

and This

CVC-complex-type.2.4.d: Invalid content was found starting with element 'base-extension'. No child element is expected at this point.

android-studio gradle

Solution 1:^[1]

Set the NDK manually, and downgrade it to 21 or lower.

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Solution	Source
Solution 1	johnnyb