ARexx Error Codes
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Lister handles are the actual address in memory of the lister structure.
Opus 5 will reject any non-valid handles with an  RC  of 10.

All commands that return data return it in  RESULT  (with the exception of
 dopus getstring  and  lister getstring ) or a specified (stem) variable;
if an error occurs, the error code is returned in  RC .

An  RC  of 0 generally indicates that everything is ok.

Error codes are:-

1       RXERR_FILE_REJECTED 
        The file you tried to add was rejected by the current lister
        filters.
        Note that this is not an error, just a warning. The file is still
        added, it will just not be visible until the filters are changed. 

5       RXERR_INVALID_QUERY 
         RXERR_INVALID_SET 
        The query/set item you specified was invalid.

6       RXERR_INVALID_NAME  
         RXERR_INVALID_KEYWORD 
        The filename or keyword you specified was invalid.

8       RXERR_INVALID_TRAP 
        The trap you tried to remove didn't exist.

10      RXERR_INVALID_HANDLE 
        The lister handle you gave was invalid.

12      RXERR_NO_TOOLBAR 
        The lister has no valid toolbar.

15      RXERR_NO_MEMORY 
        There wasn't enough memory to do what you wanted.

20      RXERR_NO_LISTER 
        A lister failed to open (usually because of low-memory).

You can convert the error codes returned in  RC  into meaningful error
messages (for error reports and so on) with the  dopus error  command.