Metafrontier and MTR codes for Cobb-Douglas Function

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I have a problem with estimating a meta-frontier (6 groups) using a Cobb-Douglas function. The commands are working well until when I get at the (READ THE DATA AND DATA MATRICES AND VECTORS) section and I am getting an error as follows:

read (sfa1.txt) group t ly lx1 lx2 lx3 lx4
 UNIT 88 IS NOW ASSIGNED TO: sfa1.txt
    7 VARIABLES AND       24 OBSERVATIONS STARTING AT OBS     137

 ****...ERROR..LESS DATA FOUND THAN EXPECTED..ZEROS USED
 TYPE COMMAND****

So I would like to know what could be causing this issue? I have also included the rest of the commands that I used in the model below.

 TYPE COMMAND
gen1 nparms = 4
 TYPE COMMAND
gen1 ngroups = 6
 TYPE COMMAND
gen1 n1 = 40
 TYPE COMMAND
gen1 n2 = 40
 TYPE COMMAND
gen1 n3 = 56
 TYPE COMMAND
gen1 n4 = 24
 TYPE COMMAND
gen1 n5 = 24
 TYPE COMMAND
gen1 n6 = 24
 TYPE COMMAND
read (parm.txt) parm /rows = nparms cols = ngroups
 UNIT 88 IS NOW ASSIGNED TO: parm.txt
       4 ROWS AND           6 COLUMNS, BEGINNING AT ROW       1

 ...SAMPLE RANGE IS NOW SET TO:         1         4
 TYPE COMMAND
do# = 1, ngroups
 TYPE COMMAND
dim b# nparms
 TYPE COMMAND
copy parm b# / fcols=#;# tcols = 1;1
 TYPE COMMAND
endo
  _do# = 1, ngroups
 ****** EXECUTION BEGINNING FOR DO LOOP  # =       1
 #_        dim b1 nparms
 #_        copy parm b1 / fcols=1;1 tcols = 1;1
 #_        endo
 #_        dim b2 nparms
 #_        copy parm b2 / fcols=2;2 tcols = 1;1
 #_        endo
 #_        dim b3 nparms
 #_        copy parm b3 / fcols=3;3 tcols = 1;1
 #_        endo
 #_        dim b4 nparms
 #_        copy parm b4 / fcols=4;4 tcols = 1;1
 #_        endo
 #_        dim b5 nparms
 #_        copy parm b5 / fcols=5;5 tcols = 1;1
 #_        endo
 #_        dim b6 nparms
 #_        copy parm b6 / fcols=6;6 tcols = 1;1
 #_        endo
 ****** EXECUTION FINISHED FOR DO LOOP  #=       6
 TYPE COMMAND
gen1 j2 = n1+1
 TYPE COMMAND
gen1 j3 = n1+n2+1
 TYPE COMMAND
gen1 j4 = n1+n2+n3+1
 TYPE COMMAND
gen1 j5 = n1+n2+n3+n4+1
 TYPE COMMAND
gen1 j6 = n1+n2+n3+n4+n5+1
 TYPE COMMAND
gen1 k2 = n1+n2
 TYPE COMMAND
gen1 k3 = n1+n2+n3
 TYPE COMMAND
gen1 k4 = n1+n2+n3+n4
 TYPE COMMAND
gen1 k5 = n1+n2+n3+n4+n5
 TYPE COMMAND
gen1 n = n1+n2+n3+n4+n5+n6
 TYPE COMMAND
smpl 1 n
 TYPE COMMAND
read (sfa1.txt) group t ly lx1 lx2 lx3 lx4