Unable to include a clip in a MutilCam Sequence

Hi there,

I am trying to use the Multicam Sequence setting for the first time however when I try to link my 5 clips (4 video files and 1 audio) into it it seems not to read one of the clips consistently.

I am making a music video using four camera's and an audio file. The Clip itself an .MTS file and works fine when editing. It is however a very long clip in which I have cut into sections (Songs) and exported as .mp4 so it is a smaller file which is easier for organising the edit of each song.

I am a bit stumped as I tried solely with just in and out markings on the original file which alas didn't work. I then tried the above file and still no luck. I also thought the audio clip may be taking its place in someway so took it out to the same result.

Am I missing a trick here or is there a problem with the file itself?

The Error message reads;

Could not synchronise one or more clips in the current selection because a match could not be found.