TUFLOW Message 2057
ERROR 2057 - Reading .mid file.
An error has occurred reading the currently active .mid file. The most likely cause is that the GIS layer has an incorrect number of attributes or incorrect attribute definitions (for example, a number attribute has been defined as a text attribute). The other most likely cause is that the .mid file has become corrupted - try re-exporting the GIS layer. The .mid file is a text file and can be viewed in a text editor.
Check the GIS attributes match those of the empty (template) .mif file. Check file can be opened in text editor, this should be text (similar to .csv). Re-export the GIS layer.