Undefined method `mysql'

[happicamper]

Hello, I stumbled across this repository and tried your cookbook.
But It seems that I have something configured incorrectly.
Here is the log:
[2018-02-16T13:36:58+08:00] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out [2018-02-16T13:36:58+08:00] FATAL: Please provide the contents of the stacktrace.out file if you file a bug report [2018-02-16T13:36:58+08:00] ERROR: undefined method `mysql' for #<Chef::Node::Attribute:0x0000000003a9af08> [2018-02-16T13:36:58+08:00] FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)

Thanks in advance!