钢质叶片的成型精度的保证方法 - The following has evaluated to null or missing: ==> content.channle [in template "WEB-INF/t/cms/yckjdsc/default/content/news.html" at line 5, column 34] ---- Tip: It's the step after the last dot that caused this error, not those before it. ---- Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use [#if myOptionalVar??]when-present[#else]when-missing[/#if]. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: ${content.channle.name!} [in template "WEB-INF/t/cms/yckjdsc/default/content/news.html" at line 5, column 32] ----