TypeError: Non-hexadecimal digit found in Shellcode

[isabellah750]

[*] Start to generate the archive file best.rar...
Traceback (most recent call last):
File "C:\Users\Uncle Tom\Desktop\hack-winrar\exp.py", line 114, in
build_file_once(filename_list[i])
File "C:\Users\Uncle Tom\Desktop\hack-winrar\exp.py", line 102, in build_file_once
build_file_add(shellcode, rar_filename)
File "C:\Users\Uncle Tom\Desktop\hack-winrar\exp.py", line 98, in build_file_add
f.write(binascii.a2b_hex(shellcode.upper()))
TypeError: Non-hexadecimal digit found