Error connecting to Tabular Editor - Compatibility Level

Hi, 

Within my report I am now unable to connect to Tabular Editor, when I try i get an error message that says - 

"The database compatibility level of 1601 is below the minimal compatibility level of 2147483647 needed for [model.Model].[table.Report1]. [measure 'Previous Month' in table 'Key Measures'].FormatStringDefinition at PowerBI mode.

Is there a way for me to change the compatibility level so this doesnt occur?

This only started when I started using dynamic format strings in my report, the new formatting for measures. 

Any advice appreciated.