keikai can't evaluate EOMONTH after upgraded from ZSS

Steps to Reproduce

1. run the war which is migrated from zss with repack.sh, replacing zss jar with keikai jar in keikai-zss-legacy-all-5.0.0.zip
2. visit index.jsp

A simple way to run a war

1. download https://repo1.maven.org/maven2/com/github/jsimone/webapp-runner/8.5.47.2/webapp-runner-8.5.47.2.jar
2. java -jar webapp-runner-8.5.47.2.jar usc_keikai.war
visit http://localhost:8080/

Current Result

NFO: Error evaluating cell 'labor Effort'!AA10 when eval EOMONTH(G$10,0)
java.text.ParseException: Unparseable date: "#NAME?"
at java.text.DateFormat.parse(DateFormat.java:366)
at edu.usc.isi.myportal.forecastmodule.laborplan.action.LaborPlanIntegrationController.populateDates(LaborPlanIntegrationController.java:1117)
at edu.usc.isi.myportal.forecastmodule.laborplan.action.LaborPlanIntegrationController.populateData(LaborPlanIntegrationController.java:1070)
at edu.usc.isi.myportal.forecastmodule.laborplan.action.LaborPlanIntegrationController.process(LaborPlanIntegrationController.java:164)
at org.zkoss.zss.api.impl.ImporterImpl.imports(ImporterImpl.java:62)
at org.zkoss.zss.api.impl.ImporterImpl.imports(ImporterImpl.java:90)
at edu.usc.isi.myportal.forecastmodule.laborplan.action.LaborPlanIntegrationController.doAfterCompose(LaborPlanIntegrationController.java:183)
at org.zkoss.zk.ui.impl.UiEngineImpl.doAfterCompose(UiEngineImpl.java:588)

Expected Result

no error

Debug Information

• this issue only happens when I replace jar with repack.sh. If I rewrite LaborPlanIntegrationController by replacing API. This error doesn't happen.
• WEB-INF/classes contains source code