First export the file from the IC-30. Open it up to see the way everything is laid out. Then massage the download file into the same format.
The error could be any little problem. Missing comma, extra space, invalid value (RFG1 vs. RFG 1).
If you are not spreadsheet savy, this could be a tough task. I have attached the memory channels.csv from my radio. (unzip it before use).
Do you have a link for the download?