That line (211) parses the $content from the file opened at the line just above it:
set fp [open $ioBdat(ioacfg) r]; set content [split [read $fp] \n]; close $fp
ioBdat(ioacfg) should be your ioA config file, which is either absent or empty or something, making lsearch choke on $content which is not as it should be.
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