TypeError: Cannot read property 'length' of undefined

[HafizABR]

When i run the command
apib2postman my_file.apib -o collection.json -e environment.json

Then it give me error.

Processing API Blueprint...
Converting to Postman Collection...
TypeError: Cannot read property 'length' of undefined
    at Function.parse (/usr/local/lib/node_modules/@apib/2postman/node_modules/uritemplate/bin/uritemplate.js:570:49)
    at /usr/local/lib/node_modules/@apib/2postman/src/index.js:105:39
    at Array.map (<anonymous>)
    at parseActions (/usr/local/lib/node_modules/@apib/2postman/src/index.js:98:18)
    at /usr/local/lib/node_modules/@apib/2postman/src/index.js:54:27
    at Array.forEach (<anonymous>)
    at /usr/local/lib/node_modules/@apib/2postman/src/index.js:41:10
    at Array.forEach (<anonymous>)
    at apib2postman (/usr/local/lib/node_modules/@apib/2postman/src/index.js:30:6)
    at /usr/local/lib/node_modules/@apib/2postman/src/index.js:324:27

I'm not able to use your service. Any help will be appreciated.