Unexpected token < in JSON at position 0

## Problem
Hit error "Unexpected token < in JSON at position 0"

## Steps to reproduce the issue

## Expected behavior
Generate Java code

## System details (run `AWS: About` and/or `Amazon Q: About`)

- OS: Windows 11 23H2
- Visual Studio Code version: 1.88.1
- AWS Toolkit version: 3.72.0
- Amazon Q version: 1.91.0

Start by reproducing the request in VS Code's Amazon Q Open chat panel on the listed Windows, VS Code, AWS Toolkit, and Amazon Q versions, then trace the response associated with the JSON parse error. Done means the example request generates Java code without the error.

Written by the indexing model from the issue text.