Reslove error using hamming encoder/decoder in simulink

Hello, I am working on an assignment where I should import an image from matlab workspace and then pass it through an AWGN channel while using Forward Error Correction. I first built the model without the FEC block and it worked great. The model is uploaded in the first file. Then I added a Hamming Encoder/Decoder and after using some blocks to solve the frame based issues (buffer) , I got the simulation running but the output is always zero so the BER is 1. I couldn't figure out the problem but I narrowed it to the first buffer block. The zero output starts from there. I attached this model in the 2nd file.

Note: To run the simulation, initialize I=imread('camerman.tif), any other image of different size would require changing the "selected samples from frame parameter in the error rate calculation block".

Any help would be appreciated. Thank You