Unable to determine the version of the current SharePoint Framework project

[Nevinia210]

Hello,
recently i tried to use m365 to update one of our solutions and i ended up with an error:
Error: Unable to determine the version of the current SharePoint Framework project

I have latest m365 version: CLI for Microsoft 365 v7.2.0
With different solutions I'm able to generate the .tour file, but with this specific one i end up with and error.

package.json:

{
  "name": "search-renderer-v4",
  "version": "0.0.1",
  "private": false,
  "main": "lib/index.js",
  "scripts": {
    "build": "gulp bundle",
    "clean": "gulp clean",
    "test": "gulp test"
  },
  "dependencies": {
    "@microsoft/sp-lodash-subset": "1.15.2",
    "@microsoft/sp-property-pane": "1.15.2",
    "@microsoft/sp-webpart-base": "1.15.2",
    "@pnp/modern-search-extensibility": "1.5.0",
    "@pnp/odata": "^2.15.0",
    "@pnp/sp": "^3.16.0",
    "@pnp/spfx-controls-react": "^3.15.0",
    "@pnp/spfx-property-controls": "^3.14.0",
    "office-ui-fabric-react": "^7.204.0",
    "react": "16.13.1",
    "react-dom": "16.13.1",
    "react-js-pagination": "^3.0.3",
    "react-text-truncate": "^0.19.0"
  },
  "devDependencies": {
    "@microsoft/eslint-config-spfx": "1.15.2",
    "@microsoft/eslint-plugin-spfx": "1.15.2",
    "@microsoft/rush-stack-compiler-4.5": "0.2.2",
    "@microsoft/sp-build-web": "1.15.2",
    "@microsoft/sp-module-interfaces": "1.15.2",
    "@rushstack/eslint-config": "2.5.1",
    "@types/react": "16.9.51",
    "@types/react-dom": "16.9.8",
    "@types/webpack-env": "~1.15.2",
    "ajv": "^6.12.5",
    "gulp": "4.0.2",
    "typescript": "4.5.5",
    "tslib": "2.3.1"
  }
}

.yo-rc.json:

{
  "@microsoft/generator-sharepoint": {
    "plusBeta": false,
    "isCreatingSolution": true,
    "version": "1.15.2",
    "libraryName": "search-renderer-v4",
    "libraryId": "b21dc463-df68-4a23-b7a6-5aa33cedce7d",
    "environment": "spo",
    "packageManager": "npm",
    "solutionName": "search-renderer-v4",
    "solutionShortDescription": "search-renderer-v4 description",
    "skipFeatureDeployment": true,
    "isDomainIsolated": false,
    "componentType": "library"
  }
}

m365 command used:
m365 spfx project upgrade --toVersion 1.18.2 --output tour

Could you advise me where could be the problem?
Thanks for advance for all answers.

[milanholemans]

Hi @Nevinia210

Weird, looking at the files you provided, the tool should be able to determine the project version. I copied your files in another project of mine and it seems to work just fine.
Are you sure that you are running the command at the root of your project?
Is there any change you can share the project with us so we can figure out what's wrong?

[Nevinia210]

Hi @milanholemans ,
i tried to remove all files from solution and make it just blank one (not even buildable), hopefully that will be enough
testupdate.zip

[milanholemans]

Ok, I'm able to replicate the error now. Will have a look at it.

[milanholemans]

Hi @Nevinia210 found the issue. In your .yo-rc.json file, you have a comment and an extra comma in your file. If you remove this comment, the JSON becomes valid again and the command works for me.

[Nevinia210]

Didn't knew that this is prohibited, I'm used to .NET where everything after // is ignored,

thanks for help @milanholemans, I appreciate it

[milanholemans]

In fact, you cannot write comments in a JSON file. Some editors allow you to do this, but this makes your JSON object actually invalid.