FCP Version 4.5 doesn’t have ProRes. That turned up in V6. You will need to convert using compressor to whatever SD codec you are able to work with. Match it to your other footage. Otherwise work down from uncompressed to DV50 (or DV if desperate.)
Don’t forget to convert the audio to 48khz at the same time. This camera has generated tons of posts here as it is a great image wrapped in a non editing codec with the wrong frame rate and audio sample rate.
Canon really should fix the obvious mistakes, but it will always need transcoding into an edit codec that FCP understands.