tiny url not working. can't input port forwarded url

[opg1313]

[*] Choose an option: 6

[] Type RPT if you fully agree to use it only for Educational Purpose: RPT
[] Choose a Port or hit Enter (Default: 3333 ): 80
[] Please wait...
[]Checking Network and System Configuration...

[*] Send this direct link to target:

[*] Or can send this tinyurl: Error

[*] Waiting For IP's and Credentials...