Phone_message.c: Unable to build dialplan routing - invalid license

attaching error log that I can not understand

[2016-09-22 10:03:00] VERBOSE[55042] pbx.c: Added extension ‘proxy’ priority 1 to dpma_pjsip_message_context
[2016-09-22 10:03:00] ERROR[55042] phone_message.c: Unable to build dialplan routing - invalid license

[2016-09-22 10:03:00] VERBOSE[55042] pbx.c: Added extension ‘proxy’ priority 1 to dpma_message_context
[2016-09-22 10:03:00] ERROR[55042] phone_message.c: Unable to build dialplan routing - invalid license
[2016-09-22 10:03:00] WARNING[55042] res_digium_phone.c: No Valid DPMA License found. Module is loaded but disabled. Please reload module once valid license is installed.

I think it’s due to the module “Digium Addons” and “Digium Phones Config”

I can remove them both from the “Module admin” system without damage?