Why does Unity ads give compile errors?

Question

contextual advertising

When compiling a project on android without unity ads, everything is fine, but as soon as it is connected, it constantly gives a different number of errors. Here is the console

Answer 1

This is usually due to the fact that libraries are duplicated. You also write that some ancient methods are used in Gradle. Perhaps you are installing Unity Ads incorrectly or there is some kind of version incompatibility.
Are you installing as an asset or through a package manager?