Converting Checkpoint Smartcenter to Fortigate 5.6

Hello, I have to convert a Checkpoint to a Fortigate Firewall. I use the new converter 5.5.0 Build0430. I have received an objectsC file from the checkpoint firewall administartor. It is in a text format (not binary). When uploading the objects.file in the converter, this error is displayed: 'Warning! please input Check point object file."

The converter doesn't like my file. I have compared it with the objects.C demo file, i don't see any differences. Do you have an idea? Thanks and kind regards, Judit