Jaspersoft generated report error on >600 pages only

Question

Using jaspersoft server api V6.5.1

Problem: Compiling a Report-(PDF) with >600 data items fails with below error.

Selecting <600 = no error. This tells me the report design is valid. Can anyone help me debug this?

----1. error message (again, only when selecting 600+ records)

Exception: net.sf.dynamicreports.report.exception.DRException: net.sf.jasperreports.engine.design.JRValidationException: Report design not valid :
 
1. The title section, the page and column headers and footers and the margins do not fit the page height.
 
 stack: [net.sf.dynamicreports.jasper.builder.JasperReportBuilder.toJasperReport(JasperReportBuilder.java:293), net.sf.dynamicreports.jasper.builder.JasperReportBuilder.toJasperPrint(JasperReportBuilder.java:324), net.sf.dynamicreports.jasper.builder.JasperReportBuilder.export(JasperReportBuilder.java:599), net.sf.dynamicreports.jasper.builder.JasperReportBuilder.toPdf(JasperReportBuilder.java:536), dynamicreports.Rep3.exportReportFile(Rep3.java:5356), dynamicreports.Rep3.makeReport(Rep3.java:4988), dynamicreports.Rep3.main(Rep3.java:5974)]

----2. how report looks as final PDF (1 page each record)

----3. report design

----4. code of template: https://community.jaspersoft.com/questions/1192881/report-error-600-pages

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