I am not able to install appmon on my iPhone

[karthick4kumaran]

Getting the following error when trying to run the
python ipa_installer.py -ipa <ipa_path>

Error
[+] Injecting DYLIB...
[+] Code-signing...
iPhone Developer: no identity found
Traceback (most recent call last):
File "ipa_installer.py", line 180, in
subprocess.check_output(["codesign", "-fs", 'iPhone Developer', injected_dylib_path])
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 573, in check_output
raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['codesign', '-fs', 'iPhone Developer', '/tmp/appmon_ipa/shared/Payload/xyz.app/FridaGadget.dylib']' returned non-zero exit status 1