Multiple data sets

The frealign input parameter file has a block of parameters (input cards 6 - 12) that can be repeated for several data sets, up to 20 times. Example:

1.0,${dstep},${target},90.0,2.0,${kV1},0.0,0.0        !RELMAG,DSTEP,TARGET,THRESH,CS,AKV,TX,TY
${rrec}, 200.0, ${rref}, ${rbf}                       !RREC,RMAX1,RMAX2,RBFACT
${working_directory}/${raw_images1}.mrc
${data_input}1_reproject.mrc_${1}_${2}
${working_directory}/${data_input}1_${prev}.par
${data_input}1_${start}.par_${1}_${2}
${data_input}1_${start}.shft_${1}_${2}
1.0,${dstep},${target},90.0,2.0,${kV2},0.0,0.0        !RELMAG,DSTEP,TARGET,THRESH,CS,AKV,TX,TY
${rrec}, 200.0, ${rref}, ${rbf}                       !RREC,RMAX1,RMAX2,RBFACT
${working_directory}/${raw_images2}.mrc
${data_input}2_reproject.mrc_${1}_${2}
${working_directory}/${data_input}2_${prev}.par
${data_input}2_${start}.par_${1}_${2}
${data_input}2_${start}.shft_${1}_${2}
1.0,${dstep},${target},90.0,2.0,${kV3},0.0,0.0        !RELMAG,DSTEP,TARGET,THRESH,CS,AKV,TX,TY
${rrec}, 200.0, ${rref}, ${rbf}                       !RREC,RMAX1,RMAX2,RBFACT
${working_directory}/${raw_images3}.mrc
${data_input}3_reproject.mrc_${1}_${2}
${working_directory}/${data_input}3_${prev}.par
${data_input}3_${start}.par_${1}_${2}
${data_input}3_${start}.shft_${1}_${2}
-100., 0., 0., 0., 0., 0., 0., 0.                     !terminator with RELMAG=0.0 or -100.0

In this example, there are three different data sets. For each, different DSTEP, TARGET, THRESH, CS, AKV, TX, TY, RREC, RMAX1, RMAX2 and RBFACT parameters can be provided although, in this example, only the voltage changes.

I tried this feature today, to read in my several spider stacks, by repeating cards 6-12. Every time,
though, I get this error, which says the file is connected to another unit. This did not happen with the
two stacks that were read in prior to this point.
-Thanks,
Celia

As follows: ....

Number of images in set 3 = 798 (on 1 new films), total particle parameters so far = 6408

Min, max phase residual = 0.000 0.000
Using X,Y distribution function:
Average X,Y shifts = -0.033 -0.175
Sigma X,Y shifts = 1.507 1.982

OUTPUT PARAMETER FILE ?
f08_gooddataINSK003.spi.par
PGFIO-F-207/OPEN/unit=33/file is already connected to another unit.
File name = f08_gooddataINSK003.spi.par
In source file cards11and12.f, at line number 42
0.0u 0.0s 0:00.09 66.6% 0+0k 0+16io 0pf+0w