Open Power Template error

Unexpected token: OP_POST_OPERATOR (--) in expression -15-15-15-14-14-14-12-14-| ------------------- H---8h10---{-------------------------|x2 --15-15-15-13-13-13 G----------{-------------------------| ------------------- D----------{-------------------------| ------------------- A----------{-------------------------| ------------------- E----------{-------------------------| ------------------- E--------12-12-12-10--14----14-

Opt_Expression_Exception

Debug mode is disabled. No additional information provided.