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Modeling a loop

Hi,

I have generated a model for my molecule.  I'm trying to study a loop
region in detail.  I followed the instruction in FAQ of the manual and
wrote the following Top file:

-------------------------------------------------------------------------------
INCLUDE
SET SEQUENCE              = 'ASLA2'
SET MODEL                 = 'ASLA2.B99990001.pdb'
SET ATOM_FILES_DIRECTORY  = './:../atom_files'
SET OUTPUT_DIRECTORY      = './'
SET PDB_EXT               = '.pdb'
SET STARTING_MODEL        = 20
SET ENDING_MODEL          = 29
SET MD_LEVEL              = 'refine1'
SET RAND_SEED             = -34871
CALL ROUTINE              = 'loop'

CALL ROUTINE              = 'cluster', ID1 = 20, ID2 = 29

SUBROUTINE ROUTINE        = 'select_atoms'

  PICK_ATOMS SELECTION_SEGMENT = '49:' '76:', SELECTION_STATUS = 'initialize'

  RETURN
END_SUBROUTINE

-----------------------------------------------------------------------------

"ASLA2.B99990001.pdb" is the file generated by the previous Modeler run.
"49" and "76" are the starting and ending residues of the loop region.
I got an error message after running this job:

-------------------------------------------------------------------------------
TOP______>   102  414 STRING_OPERATE OPERATION = 'CONCATENATE',                ;
                        STRING_ARGUMENTS = SEQUENCE '.mat',  RESULT = MATRIX_FI;
                      LE 


TOP______>   103  415 SET ROOT_NAME = SEQUENCE 


TOP______>   104  416 RETURN 


TOP______>   105  591 STRING_OPERATE OPERATION = 'CONCATENATE',               ;
                        STRING_ARGUMENTS = '$(JOB).rsr',  RESULT = LOOP_CSRFILE 

assgn___E> cannot assign a value to a value:      

-------------------------------------------------------------------------------

Do you know what went wrong?

Thanks.

Tom