This error message is generated when SpecWare is trying to append newly downloaded data to a data file that has characters after the last line of data. This can happen if the existing file has had data manually added or deleted, or if the file has otherwise been manipulated with a text editor.
Download the data logger again. Instead of saving the data to an existing Logger Location, create a new Logger Location (with a name such as "test"). If SpecWare is able to successfully save the data to this new location, there is probably a problem with the existing data file. In this case, contact Spectrum Technologies for technical assistance.