Build failed for ASP.NET Core 3.1

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I cannot build my ASP.NET Core 3.1 application and after several unsuccessfull attempts I think it’s time to figure out with the community what’s the problem.

Build: https://travis-ci.org/github/stanislavstoyanov99/CinemaWorld/jobs/686546731
Build config: https://travis-ci.org/github/stanislavstoyanov99/CinemaWorld/jobs/686546731/config

Here’s my repo in GitHub: https://github.com/stanislavstoyanov99/CinemaWorld

I think the problem is that my travis file is not in the same folder with the solution file, so I put directory path in travis configuration file, but maybe I have some mistakes.

Thanks in advance, @joshua-anderson, @akoeplinger !