Missing helper: "commoncomment"

[phun-ky]

With this line in a custom format:

{{#if prop.comment}}{{{commoncomment prop.comment}}}{{/if}}

I get:

[20:53:17] Starting '<anonymous>'...
[20:53:17] '<anonymous>' errored after 38 ms
[20:53:17] Error in plugin 'gulp-theo'
Message:
    Missing helper: "commoncomment"
Details:
    description: undefined
    fileName: undefined
    lineNumber: undefined
    number: undefined
    domainEmitter: [object Object]
    domain: [object Object]
    domainThrown: false
[20:53:17] The following tasks did not complete: default, <series>, <series>, generateVariables
[20:53:17] Did you forget to signal async completion?

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