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FATAL ERROR in
action number 1
of Step Event0
for object app:
string_length argument 1 incorrect type (unknown) expecting a String (YYGS)
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called from - gml_Script_buffer_write_string (line 1)
called from - gml_Script_json_save_value (line 1)
called from - gml_Script_json_save_var (line 1)
called from - gml_Script_project_save_template (line 18)
called from - gml_Script_project_save_objects (line 1)
called from - gml_Script_project_save (line 21)
called from - gml_Script_action_toolbar_save (line 2)
called from - gml_Script_app_update_keyboard (line 33)
called from - gml_Script_app_event_step (line 17)
called from - gml_Object_app_Step_0 (line 0)