Using Excel-files including underscores in tabs and column-names and having no problems. You can rule that out.
Never seen the error, but looks like something in the area of having defined a key-field in the template settings, but the attribute has more than one value in the database
The error is a JavaScript error, so i guess it has nothing to do with the ExcelImporter, but that you ran into a probably completely unrelated other bug. Is it reproducible? If so, can you file a bug report?
I caught on what was causing it later last night, and forgot to feedback here.
I had all the parts needed in the application, but accidently connect the wrong microflow to the onstart, which caused the model reflection to misbehave, in turn causing the importer problems.
I am trying to fix and reproduce now, but current trafic is jamming me, so more later !
I am still having trouble gettin this to work
Also, when creating the kolom definitions by hand, and trying to import, I get no errormessages, the "File Imported" message, but no results