Problem in your project's configuration. Parse error in .readthedocs.yml: YAML: expected '<document start>', but found '<block mapping start>' in "<unicode string>", line 9, column 1: sphinx: ^

Problem in your project's configuration. Parse error in .readthedocs.yml: YAML: expected '<document start>', but found '<block mapping start>' in "<unicode string>", line 9, column 1: sphinx: ^

Problem in your project's configuration. Invalid configuration option "build.os": build not found