I have the code but I keep getting an error A2006: undefined symbol. Heres a screenshot

A. (8 points) Implement the following expression in assembly language: AX= val2 + 9 + va13-vall Assume that vall, val2, and val3 are 16-bit integer memory variables. * Besides, val2 and val3 are unsigned integer while vall is signed integer "Assign val2-11, val3-16, vall-6. Use the debugger to verify the result in AX. -Report AX value in decimal as part of the Comment header: A. (8 points) Implement the following expression in assembly language: AX= val2 + 9 + va13-vall Assume that vall, val2, and val3 are 16-bit integer memory variables. * Besides, val2 and val3 are unsigned integer while vall is signed integer "Assign val2-11, val3-16, vall-6. Use the debugger to verify the result in AX. -Report AX value in decimal as part of the Comment header