There is an error in compilerconfig.json file. This could be due to a change in the format after this extension was updated

Question

I use WebCompiler tool for Visual Studio 2017. But I am starting to get an error. This Error Message is:" There is an error in compilerconfig.json file. This could be due to a change in the format after this extension was updated".

I thought the error originated from the file. I created new project and I do a test. But it didn't work. I got the same error again. My compilerconfig file:

[
  {
    "outputFile": "assets/scss/test-page.css",
    "inputFile": "assets/scss/test-page.scss"
  }
]

Error Message