font configuration / Fiori2 / WebIDE

Hi folks, what to do with this error in SAP WebIDE ... I just changed from 1.52.X to 1.60.2 and I'm now getting this error? How to resolve it?

2019-01-04 10:56:48.204000 The font configuration for collection 'Fiori2' is not registered - 
c @ sap-ui-core.js:180

Best regards

Volker