ASM error

Hi Team

Please I have an issue when I am trying to Add 0x81 - allowed to Character Set I am getting the following error

crit g_server_rpc_handler.pl[2739]: 01310027:2: ASM subsystem error (asm_config_server.pl,F5::ASMConfig::Handler::log_error_and_rollback): Could not update the Character Set 'URL Character Set'. Failed validating value '129' for : The value is out of range (maximum value = 127)

I am not able to find this Character in the Character list to change it

Could you please help me with this ?

Thanks in advance