'Core' does not contain a definition for 'isVisible' and no accessible extension method 'isVisible' accepting a first argument of type 'Core' could be found (are you missing a using directive or an assembly reference?)

'Core' does not contain a definition for 'isVisible' and no accessible extension method 'isVisible' accepting a first argument of type 'Core' could be found (are you missing a using directive or an assembly reference?)

Process completed with exit code 1.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The field 'Core.isVisible' is assigned but its value is never used