Show error message in output window when trigger "Detect Breaking Change"

[alisa-1020]

In Command Palette, trigger "Detect Breaking Change"
Select first API specification document——Local File—— select any yaml file
Select second API specification document——Locl File——select any yaml file
breaking change work well but output window has Error

[microsoft-github-policy-service]

Thank you for contacting us! Any issue or feedback from you is quite important to us. We will do our best to fully respond to your issue as soon as possible. Sometimes additional investigations may be needed, we will usually get back to you within 2 days by adding comments to this issue. Please stay tuned.

[formulahendry]

The error does not affect the feature, so mark as p2