AVPlayerStatusFailed and error code "Can not Decode"

I work with C4 Alpha, and I came across two errors that, in my opinion, cannot figure out how to solve them. My code setup is as follows:

-(void)setup {    
[self setupFrames];



m1 = [[MyMovie alloc] initWithMovieName:@"d3.mov" andFrame:iPadLandscape];
[m1 addGesture:PAN name:@"panGesture" action:@"move:"];
[self.canvas addMovie:m1];


m2 = [[MyMovie alloc] initWithMovieName:@"e2.mov" andFrame:iPadLandscape];
[m2 addGesture:PAN name:@"panGesture" action:@"move:"];
[self.canvas addMovie:m2];


m3 = [[MyMovie alloc] initWithMovieName:@"e1.mov" andFrame:iPadLandscape];
[m3 addGesture:PAN name:@"panGesture" action:@"move:"];
[self.canvas addMovie:m3];


m4 = [[MyMovie alloc] initWithMovieName:@"d4.mov" andFrame:iPodPortrait];
[m4 addGesture:PAN name:@"panGesture" action:@"move:"];
[self.canvas addMovie:m4];

m5 = [[MyMovie alloc] initWithMovieName:@"o1.mov" andFrame:iPodLandscape];
[m5 addGesture:PAN name:@"panGesture" action:@"move:"];
[self.canvas addMovie:m5];


m6 = [[MyMovie alloc] initWithMovieName:@"o2.mov" andFrame:iPodLandscape];
[m6 addGesture:PAN name:@"panGesture" action:@"move:"];
[self.canvas addMovie:m6];

}

Two errors that I encountered are as follows: - "AVPlayerStatusFailed" on C4 and - "Unable to decode, the decoder required for this medium is busy." on my canvas, as well as some of the videos on the canvas show as black squares.

I tried to follow the answers to this previous post, but I don't know how to apply it to C4.

stack overflow

Any ideas how to fix this?