HI,
Thanks for your answer.
The version of powerbi desktop is the latest. April 2018. 32 bit
The data source is .xls files.
In the data model I have created a new table from an all.select of one of the data sources and I am creating multiple columns in that table. When creating multiple columns gives the error explained.
SimpleDocumentEvaluator/GetResult/Compile {"Start":"2018-04-25T10:59:07.7997369Z","Action":"SimpleDocumentEvaluator/GetResult/Compile","HostProcessId":"4684","ProductVersion":"2.57.5068.501 (PBIDesktop)","ActivityId":"500e4595-3f32-43b1-9a67-4c0bc4fc4aff","Process":"Microsoft.Mashup.Container.NetFX40","Pid":5944,"Tid":1,"Duration":"00:00:00.3301974"}
25T10:59:29.3985544Z","Action":"DocumentEvaluator/GetResult<Microsoft.Mashup.Evaluator.Interface.IPreviewValueSource>","HostProcessId":"4684","ProductVersion":"2.57.5068.501 (PBIDesktop)","ActivityId":"500e4595-3f32-43b1-9a67-4c0bc4fc4aff","Process":"PBIDesktop","Pid":4684,"Tid":11,"Duration":"00:00:00.0131483"}
Thank you!