JBake Freemarker 错误 "this has evaluated to a sequence (wrapper: f.t.SimpleSequence"

JBake Freemarker errror "this has evaluated to a sequence (wrapper: f.t.SimpleSequence"

给出一个 jbake.properties 和:

description: OptaPlanner optimizes business resource usage. It is a lightweight, embeddable, open source planning engine, written in 100% Java.

还有一个模板:

<meta property="description" content="${config.description}">

Freemarker 抛出这个错误

this has evaluated to a sequence (wrapper: f.t.SimpleSequence

诀窍是转义 jbake.properties 中的 ,:

description: OptaPlanner optimizes business resource usage. It is a lightweight\, embeddable\, open source planning engine\, written in 100% Java.