One question: are you trying with the latest version? The error seems to be related with an older version of icomancer trying to parse newer packs...
Please download the latest update:
http://mirror1.lavasoftworks.com/icomancer/downloads/releases/1.1.2.87/icomancer-Update...
and, if possible, the latest hotfix:
http://www.lavasoftworks.com/icomancer/forum/index.php?id=32
That should be enough. If not, please let me know!