freemarker usage

[highvoltagecontrol]

Hi, I am trying to generate c or h or scatter file from ftl templates for STM32L5 example. I have installed freemarker-cli under ubuntu and trying to use STML5.rzone or .azone xml files for the generation

~/firewall/CMSIS-Zone/Examples/STM32L5/Zone$ freemarker-cli -t ftl/mem_layout.h.ftl and getting an error

java.lang.RuntimeException: Failed to render FreeMarker Template: ftl/mem_layout.h.ftl
at com.github.sgoeschl.freemarker.cli.FreeMarkerTask.call(FreeMarkerTask.java:79)
at com.github.sgoeschl.freemarker.cli.FreeMarkerTask.call(FreeMarkerTask.java:61)
at com.github.sgoeschl.freemarker.cli.Main.callOnce(Main.java:151)
at com.github.sgoeschl.freemarker.cli.Main.lambda$call$0(Main.java:141)
at java.base/java.util.stream.IntPipeline$4$1.accept(IntPipeline.java:246)
at java.base/java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:104)
at java.base/java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:712)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:520)
at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:483)
at com.github.sgoeschl.freemarker.cli.Main.call(Main.java:141)
at com.github.sgoeschl.freemarker.cli.Main.call(Main.java:47)
at picocli.CommandLine.executeUserObject(CommandLine.java:1783)
at picocli.CommandLine.access$900(CommandLine.java:145)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2141)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2108)
at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:1975)
at picocli.CommandLine.execute(CommandLine.java:1904)
at com.github.sgoeschl.freemarker.cli.Main.execute(Main.java:124)
at com.github.sgoeschl.freemarker.cli.Main.main(Main.java:116)
Caused by: freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> zone [in template "ftl/mem_layout.h.ftl" at line 4, column 8]

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Tip: If the failing expression is known to 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: #list zone as z [in template "ftl/mem_layout.h.ftl" at line 4, column 1]

    at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
    at freemarker.core.Expression.assertNonNull(Expression.java:251)
    at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:104)
    at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94)
    at freemarker.core.Environment.visit(Environment.java:367)
    at freemarker.core.Environment.visitAndTransform(Environment.java:496)
    at freemarker.core.CompressedBlock.accept(CompressedBlock.java:42)
    at freemarker.core.Environment.visit(Environment.java:331)
    at freemarker.core.Environment.visit(Environment.java:337)
    at freemarker.core.Environment.process(Environment.java:310)
    at freemarker.template.Template.process(Template.java:383)
    at com.github.sgoeschl.freemarker.cli.FreeMarkerTask.call(FreeMarkerTask.java:74)
    ... 22 more

Propably, I dont know how to inform free-marker for the inputing .rzone or .azone files to model generator.