11:23:20,717 SEVERE [freemarker.runtime] (/reports/templates/dependency_graph.ftl_dependency_graph_report.2.html) Error executing FreeMarker template: freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> reportModel.projectModel.rootFileModel.SHA1Hash  [in template "reports/templates/dependency_graph.ftl" at line 135, column 29]
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Tip: It's the step after the last dot that caused this error, not those before it.
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Tip: If the failing expression is known to be 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)??
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FTL stack trace ("~" means nesting-related):
        - Failed at: ${reportModel.projectModel.rootFileMo...  [in template "reports/templates/dependency_graph.ftl" at line 135, column 27]
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        at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
        at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:465)
        at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:387)
        at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:356)
        at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:96)
        at freemarker.core.DollarVariable.accept(DollarVariable.java:59)
        at freemarker.core.Environment.visit(Environment.java:326)
        at freemarker.core.Environment.visit(Environment.java:332)
        at freemarker.core.Environment.visit(Environment.java:332)
        at freemarker.core.Environment.process(Environment.java:305)
        at freemarker.template.Template.process(Template.java:378)
        at org.jboss.windup.reporting.freemarker.FreeMarkerIterationOperation.perform(FreeMarkerIterationOperation.java:142)
        at org.jboss.windup.reporting.rules.rendering.RenderReportRuleProvider$FreeMarkerThreadedRenderer$1.call(RenderReportRuleProvider.java:136)
        at org.jboss.windup.reporting.rules.rendering.RenderReportRuleProvider$FreeMarkerThreadedRenderer$1.call(RenderReportRuleProvider.java:120)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)