The files are created, It seems to be an error with the path variable in signtool.exe.
[+] Loading public key of www.ibm.com in Memory... [+] Cloning Certificate Version [+] Cloning Certificate Serial Number [+] Cloning Certificate Subject [+] Cloning Certificate Issuer [+] Cloning Certificate Registration & Expiration Dates [+] Signing Keys [+] Creating certs\www.ibm.com.crt and certs\www.ibm.com.key [+] Clone process completed. Creating PFX file for signing executable... [+] Platform is Windows OS... [+] Signing signedhttpproxy.exe with signtool.exe... [X] Something Went Wrong! [X] Exception: [WinError 2] The system cannot find the file specified