Hiro Platfrom: Deploy to Testnet: 'use of unresolved function errors'

[enjoywithouthey]

GM Fam,

I am trying to deploy a contract to testnet using Hiro's deploy platform. I am getting a series of use of unresolved function errors throughout the code. int-to-ascii index-of? slice?

these return the error. My contract works perfectly in the devnet environment and clarient console. I can't find any documentation anywhere why this is happening.

An y suggestions?