15 Project link errors
Undefined symbol '_com1_status' referenced in "dianji.c".
Undefined symbol '_comvalue1' referenced in "dianji.c".
Undefined symbol '_data_back_num' referenced in "dianji.c".
Undefined symbol '_async_timerID' referenced in "dianji.c".
Undefined symbol '_data_back_select' referenced in "dianji.c".
Undefined symbol '_is_command' referenced in "dianji.c".
Undefined symbol '_is_current' referenced in "dianji.c".
Undefined symbol '_is_voltage' referenced in "dianji.c".
Undefined symbol '_is_temp' referenced in "dianji.c".
Undefined symbol '_is_rvdt' referenced in "dianji.c".
Undefined symbol '_color_back_ground' referenced in "dianji.c".
Undefined symbol '_color_grid' referenced in "dianji.c".
Undefined symbol '_num_grid_x' referenced in "dianji.c".
Undefined symbol '_num_grid_y' referenced in "dianji.c".
Undefined symbol '_points_per_screen' referenced in "dianji.c".
运行时老出现这个问题,什么原因,怎么解决,有关毕业设计,希望大家帮忙解决,谢谢啦!使用的是LabWindows/CVI编程。