Normally this problem is due to the corruption of a VLS member
for various reasons (storage violations or abends during edits, etc).
A selective restore of the corrupted member will normally resolve
the problem. It is also normally recommended that the library be
backed up, reformatted, and restored to ensure that the library is ok.
Other considerations include making sure that the library is properly
defined in terms of namelength and blocksize, and that the blocksize
of the library as defined by VLSUTIL matches the CICS blocksize in the
FCT for the library.
VLSUTIL to backup the file, reformat it, and restore the file from the backup should resolve the problem. and retry the import.