In the Field Calculator dialog select Python parser at the top instead of VB and try again.The only other thing I would check is the length and type of the acctID_len and Acctnum_Len fields.If they are TEXT fields make sure the field length is not less than the number of characters it will hold.
Right click on field_len column > Field Calculator > len(!String Field!)Right click on the other column > Field Calculator > !String Field![0:10]
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