Cut Command error cut: Bad range

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# 1  
Old 05-21-2011
Cut Command error cut: Bad range

Can anyone what I am doing wrong while using cut command.
for f in *.log
    Log "Log file Name: $logfilename"
    logfile1=`basename $logfilename .log`
    Log "file length $flength"
    from_length=$(($flength - 15))
    Log "from length $from_length"
    logfile_date=`echo $logfile1 | cut -c ${from_length}-8`
    Log "Logfile date with stringlength $logfile_date"

Getting error in cut command for a file as
I want use cut command.

The error is showing
+ + echo INT_put_daily_stock_tax_to_ML_20110520_002258 
+ cut -c 30-8 
cut: Bad range "30-8" in list

Don't know what is wrong when used cut command.
# 2  
Old 05-21-2011
A range must be lower - upper values
From 30 to 8 mean's nothing.
# 3  
Old 05-22-2011
Thank you
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