2573691 - IFlow deployment is failing with GBException

The IFlow deployment in Web UI ends with this error:

In the Tail log of the tmn node you can find these error messages:

2017 12 04 10:30:13#+00#ERROR#com.sap.it.gb.processor.GenerationAndBuild##anonymous#pool-121-thread-1#na#<accountID>#<tmn_node_name>#web##na#na#na#na#Generation, build and deploy failed for <IFlow_name> with error - while trying to invoke the method org.eclipse.emf.ecore.resource.Resource.load(java.io.InputStream, java.util.Map) of a null object loaded from local variable 'resource' com.sap.it.gb.core.GBException: Generation, build and deploy failed for <IFlow_name> with error - while trying to invoke the method org.eclipse.emf.ecore.resource.Resource.load(java.io.InputStream, java.util.Map) of a null object loaded from local variable 'resource'
 at com.sap.it.gb.processor.GBOperations.performGeneration(GBOperations.java:284)
 at com.sap.it.gb.processor.GenerationAndBuild.doValidateAndGenerate(GenerationAndBuild.java:237)
 at com.sap.it.gb.processor.GenerationAndBuild.doGenerateAndBuild(GenerationAndBuild.java:164)
 at com.sap.it.gb.processor.GenerationAndBuild.access$200(GenerationAndBuild.java:50)
 at com.sap.it.gb.processor.GenerationAndBuild$1.call(GenerationAndBuild.java:374)
 at com.sap.it.gb.processor.GenerationAndBuild$1.call(GenerationAndBuild.java:368)
 at java.util.concurrent.FutureTask.run(FutureTask.java:262)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:622)
 at java.lang.Thread.run(Thread.java:807)
Caused by: java.lang.NullPointerException: while trying to invoke the method org.eclipse.emf.ecore.resource.Resource.load(java.io.InputStream, java.util.Map) of a null object loaded from local variable 'resource'
 at com.sap.it.ictools.mapping.gen.resource.GeneratorResProvider.getResource(GeneratorResProvider.java:104)
 at com.sap.it.ictools.mapping.gen.resource.GeneratorResProvider.getResource(GeneratorResProvider.java:90)
 at com.sap.it.ictools.mapping.gen.resource.GeneratorResProvider.getResource(GeneratorResProvider.java:75)
 at com.sap.it.ictools.mapping.context.xsd.SingleMessageStrategy.getMessage(SingleMessageStrategy.java:44)
 at com.sap.it.ictools.mapping.context.xsd.XSDRootContextProvider.getMessage(XSDRootContextProvider.java:59)
 at com.sap.it.ictools.mapping.context.xsd.XSDRootContextProvider.getRootContextObject(XSDRootContextProvider.java:41)
 at com.sap.it.ictools.mapping.context.ContextObjectFactory.getRootContextObject(ContextObjectFactory.java:21)
 at com.sap.it.ictools.mapping.generator.MappingTransformer.getContextRoot(MappingTransformer.java:199)
 at com.sap.it.ictools.mapping.generator.MappingTransformer.generateSource(MappingTransformer.java:108)
 at com.sap.it.ictools.mapping.generation.integration.SourceCodeGenerator.generateCompiledJar(SourceCodeGenerator.java:63)
 at com.sap.it.ictools.mapping.generation.integration.SourceCodeGenerator.generate(SourceCodeGenerator.java:118)
 at com.sap.it.gb.generation.GeneratorInvokerImpl.invoke(GeneratorInvokerImpl.java:85)
 at com.sap.it.gb.processor.GBOperations.performGeneration(GBOperations.java:267)
 ... 9 common frames omitted

SAP Cloud Integration 

SAP Cloud Integration, SAP CPI, SFSF, tenant, IFlow, Integration Flow, deployment, model configurator, properties, tracing, payload, HCI tooling, mapping, GBException, WEBUI, Eclipse, extension, wsdl, xsd, source, target structure , KBA , LOD-HCI-PI-MAP , Integration Mapping Service , LOD-HCI-PI-ET-IFL , Integration Designer , LOD-HCI-PI-WT-IFL , Integration Designer , Problem