variable type output to fixed type in DBPSK modulator

HI

I am trying to simulate and generate a code for DBPSK modem as given in the attached simulink file.

it runs perfect for BPSK modem but when I try to generate c code it show error :

My requirement is DBPSK modem.DBPSK modem neither runs for simulation and nor even for c code generation.

Examine the configurations of 'DBPSK_Tx_Rx_Riz_nochannelslx/RX_micro/BPSK Demodulator Baseband/M-DPSK Demodulator Baseband' for one of the following scenarios: 1) the block does not support variable-size signals; 2) the block supports variable-size signals but needs to be configured for them."

Error it gives"Simulink cannot propagate the variable-size mode from the output port 1 of 'DBPSK_Tx_Rx_Riz_nochannelslx/RX_micro/DBPSK Demodulator Baseband/In1' to the input port 1 of 'DBPSK_Tx_Rx_Riz_nochannelslx/RX_micro/DBPSK Demodulator Baseband/M-DPSK Demodulator Baseband'. This input port expects a fixed-size mode. The variable-size mode originates from 'DBPSK_Tx_Rx_Riz_nochannelslx/RX_micro/Symbol Synchronizer'. Examine the configurations of 'DBPSK_Tx_Rx_Riz_nochannelslx/RX_micro/DBPSK Demodulator Baseband/M-DPSK Demodulator Baseband' for one of the following scenarios: 1) the block does not support variable-size signals; 2) the block supports variable-size signals but needs to be configured for them."

Component:Simulink | Category:Block error

Kindly someone help me how can I get rid of the errors in either of the file.

NOte:

Main issue is to convert variable type output to fixed type data.