بنية FreeMarker غير صالح.

Java method "com.sun.proxy.$Proxy101.getCategory(long)" threw an exception when invoked on com.sun.proxy.$Proxy101 object "com.liferay.asset.categories.internal.service.AssetCategoryPropertyAssetCategoryLocalServiceWrapper@7c425093"; see cause exception in the Java stack trace.

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FTL stack trace ("~" means nesting-related):
- Failed at: #assign category = AssetCategoryLocal... [in template "template_id" at line 6, column 4]
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