Error code 3021 -- MIDRANGE-L

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When I attempt to execute the code below I get an error code of 3021, which
I can't find anywhere. Does anybody know what this error code means?

Thanks,

Albert

 D F_SETFL         s             10i 0 inz(4) 
 D Non_Block        s             10i 0 inz(4) 
D SocketID           s              10i 0

 D fcntl           PR            10i 0 ExtProc('fcntl')  
 D  fcntl_skt                    10i 0                   
 D  fnctl_cmd                   10i 0                   
 D  fcntl_opt                    10i 0   

 C                   eval      rc = fcntl(SocketID:F_SETFL:Non_Block)

                                                         
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