What is wrong with this for loop?

This for loop basically checks a field consisted of six subfields in it and get the length of each subfield. It adds them up to get the total length of the field.

for {set idx 0}{$idx < 6}{incr idx 1}{   set tempVar [lindex $xlateInVals $idx]   set count [expr $count+[string length $tempVar]] } errorInfo: extra characters after close-brace while compiling “for {set idx 0”    (compiling body of proc “xlt_40_chars”, line 7)    invoked from within “xlt_40_chars”

Where is extra charcters that this error msg is talking about????

Any help will be appreciated.