Try not to use outdated programs that are no longer distributed by their developers. This should fix it for you-
Backup / Format your sd card
Extract wiimod-v3_bb2_cb2.zip to sd:\
Click on the sd icon from the main wii channel screen
Load the boot.dol, wiimod should load
Select load another ios, reload ios 236 or 249
Select the advanced menu
Select any title manager
Select system titles
Be sure not to delete any other system titles or you many not be very happy about it.
You have most likely used dop-ios mod v11.3-11.4 or perhaps a version of pimp my wii that fails to remove ios0 after doing its system scans.