Value cannot be null. Parameter name: Non-null assertion failure: mFormulaText

Hi martinmcmillan  - 

Check your GIT repo for corrupted or incomplete .m definitions:

Go to YourProjectFolder\DataModel\

Open the affected table folders (each table should have a .m file)

Look for any empty or missing .m files (especially for tables created from Query Editor or manual definitions)

Revert the DataModel and DataModelSchema folders to a working commit:

Even if you reverted the whole project, verify specifically that the *.m files are not null or blank.

Restore from a version that successfully opened before the sync/merge.

Clean and re-clone the repository:

Sometimes your local repo may cache corrupted metadata.

Delete your local repo, then re-clone from the remote, preferably from a known-good commit.

Use Power BI Desktop December 2024 or earlier:

The March 2025 update introduced more aggressive validation and may break loading PBIP projects with minor issues.

Try opening the PBIP with an older version and see if it loads.