[Therion] Can't symbol-assign line rope

Hi, I have modified a little the line rope symbols SKBB, making a new "l_rope_ECMB". But I can't assign the new symbol. Therion compilation show a error: :\Program Files (x86)\Therion\therion.exe: error -- Simbologia_ECB_2000.th [726] -- Simbologia_ECB_2000.th [726] -- symbol can not be assigned -- line rope    [line 726]       symbol-assign line rope ECMB Same error with:     symbol-assign line rope SKBB Regards, Evaristo.