PROBLEM WITH TEMPLATE, CHECK YOUR FTL (reader/pageflip/swipe.ftl):
freemarker.core._TemplateModelException: Java method "vnp.PublishedIssue.countPages(String)" threw an exception when invoked on vnp.PublishedIssue object "vnp.PublishedIssue[ id=971695 ]"; see cause exception in the Java stack trace.

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FTL stack trace ("~" means nesting-related):
	- Failed at: #assign totPages = issue.countPages(b...  [in template "reader/pageflip/swipe.ftl" at line 7, column 5]
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