ValueError('File does not include valid YAML: {0}') when using YmlFileSource

[dvaccarosenna]

Describe the bug
YmlFileSource throws this error when the file content is invalid YAML, the error message features {0} instead of an actual value (of the file path)

To Reproduce

1. Create an invalid YAML config file
2. Attempt to load this file with the YmlFileSource class

Expected behavior
An error is thrown with the file path included

**Environment: **

• Version [e.g. 1.0.0]