I know very little about tcl programming (during college break I will study the language like crazy, but until that time...), so I don't know if this error can be easily correctly or not. I found a wonderful rss eggdrop script, however when executing the program, I get the following error...
There's probably a "string map" somewhere with a map that has an uneven number of chars, like this: string map {a b c} "aaa". Changing that to "string map {a b c d} "aaa"" would fix it.