"Syntax Error" in Hopper Disassembler while assembling instruction

Question

I am trying to follow this tutorial https://dhiyaneshgeek.github.io/mobile/security/2021/12/25/hopper-disassembler/ which shows how to bypass the jailbreak detection in a sample demo app named "SecureStoreV1.ipa".

The idea is to break the tbz (test bit and branch if zero) ARM instruction and convert it into `tbnz' (test bit and branch if not zero).

Having a paid version of hopper, it allows me to directly change the instruction via GUI but while doing so, it gives me a syntax error. Attaching screenshot for reference.

Can anyone help me here please? What am I doing wrong?