more informative error message
more informative error message

arocchi/Klampt,YilunZhou/Klampt,krishauser/Klampt,krishauser/Klampt,hpbader42/Klampt,krishauser/Klampt,stevekuznetsov/Klampt,YilunZhou/Klampt,hpbader42/Klampt,hpbader42/Klampt,bbgw/Klampt,stevekuznetsov/Klampt,YilunZhou/Klampt,bbgw/Klampt,arocchi/Klampt,arocchi/Klampt,hpbader42/Klampt,arocchi/Klampt,stevekuznetsov/Klampt,YilunZhou/Klampt,stevekuznetsov/Klampt,krishauser/Klampt,hpbader42/Klampt,bbgw/Klampt,bbgw/Klampt,krishauser/Klampt,krishauser/Klampt