After uploading your file, you receive a warning for "Object defined in ICC-based RGB". This means that the image was created in the RGB colour space (which is what in normally used for digital files) and it needs to be converted to the CMYK colour space (which, on the other hand, is used in printing).
Please note that this is a minor warning and can be ignored.
You can either:
1. ignore the warning and proceed with the order - in this case, the system will automatically convert your file from RGB to CMYK
2. convert your file to CMYK and re-upload it