I'm sorry, but an uncaught exception occurred.

While running game code:

File "game/code/scenario/chapter_1/plot_1.rpy", line 6, in script
File "game/code/scenario/chapter_1/plot_1.rpy", line 6, in <module>
File "game/code/systems/phone_system.rpy", line 212, in write_new_messenge
File "game/code/systems/phone_screens.rpy", line 477, in execute
File "game/code/systems/phone_screens.rpy", line 477, in execute
File "game/code/systems/phone_screens.rpy", line 478, in execute
File "game/code/systems/phone_screens.rpy", line 480, in execute
File "game/code/systems/phone_screens.rpy", line 480, in execute
File "game/code/systems/phone_screens.rpy", line 560, in execute
File "game/code/systems/phone_screens.rpy", line 566, in execute
File "game/code/systems/phone_screens.rpy", line 572, in execute
File "game/code/systems/phone_screens.rpy", line 575, in execute
File "game/code/systems/phone_screens.rpy", line 579, in execute
File "game/code/systems/phone_screens.rpy", line 595, in execute
File "game/code/systems/phone_screens.rpy", line 602, in execute
File "game/code/systems/phone_screens.rpy", line 608, in execute
File "game/code/systems/phone_screens.rpy", line 624, in execute
File "game/code/systems/phone_screens.rpy", line 624, in keywords
File "game/code/systems/phone_screens.rpy", line 626, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'

-- Full Traceback ------------------------------------------------------------

Full traceback:
File "game/code/scenario/chapter_1/plot_1.rpy", line 6, in script
File "renpy/ast.py", line 823, in execute
File "renpy/python.py", line 1178, in py_exec_bytecode
File "game/code/scenario/chapter_1/plot_1.rpy", line 6, in <module>
File "game/code/systems/phone_system.rpy", line 212, in write_new_messenge
File "renpy/exports.py", line 1661, in pause
File "renpy/ui.py", line 301, in interact
File "renpy/display\core.py", line 2211, in interact
File "renpy/display\core.py", line 2733, in interact_core
File "renpy/display\displayable.py", line 431, in visit_all
File "renpy/display\displayable.py", line 431, in visit_all
File "renpy/display\displayable.py", line 431, in visit_all
File "renpy/display\screen.py", line 480, in visit_all
File "renpy/display\core.py", line 2733, in <lambda>
File "renpy/display\screen.py", line 491, in per_interact
File "renpy/display\screen.py", line 697, in update
File "game/code/systems/phone_screens.rpy", line 477, in execute
File "game/code/systems/phone_screens.rpy", line 477, in execute
File "game/code/systems/phone_screens.rpy", line 478, in execute
File "game/code/systems/phone_screens.rpy", line 480, in execute
File "game/code/systems/phone_screens.rpy", line 480, in execute
File "game/code/systems/phone_screens.rpy", line 560, in execute
File "game/code/systems/phone_screens.rpy", line 566, in execute
File "game/code/systems/phone_screens.rpy", line 572, in execute
File "game/code/systems/phone_screens.rpy", line 575, in execute
File "game/code/systems/phone_screens.rpy", line 579, in execute
File "game/code/systems/phone_screens.rpy", line 595, in execute
File "game/code/systems/phone_screens.rpy", line 602, in execute
File "game/code/systems/phone_screens.rpy", line 608, in execute
File "game/code/systems/phone_screens.rpy", line 624, in execute
File "game/code/systems/phone_screens.rpy", line 624, in keywords
File "game/code/systems/phone_screens.rpy", line 626, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'