Error Message when Using Power Query

[Graemea]

Hi,

I've created a very simple Table using Power Query.

There are literally just a few columns and rows in the source data.

After I created the Table from PQ I tried to save the workbook and got error messages something like:

"Your changes could not be saved because of a sharing violation", and

"The format and extension of "XXXXXXXX" don't match", and

"The file could be corrupted and unsafe".

I also tried to delete the workbook and got a message about the Microsoft.Mashup.Container.Loader

The source data couldn't be simpler with just a few transformations but somehow this error keeps happening.

Can anyone please suggest what could be causing this

Thanks!