Power BI Dataflows error

Hi all,

My dataflow was refreshing fine until today. I haven't made any change and I am getting the following error:

Privacy settings don't allow the combining of data from multiple sources in the same query. To refresh this dataflow you can either edit the queries or you can allow combining data from multiple sources in the Edit queries Options settings.

The thing is that I am not combining data. All my queries read directly from sql data base and no merges or data combining are done after the first step. Has anyone experienced the same problem? Why is this error happening then?

Thanks