Error in gpt coregistration operation

Hi
I am getting the following error while executing
gpt “Coregister.xml” -e
with GPT and the same thing works in tool,attached xml file for reference.
ERROR
WARNING: org.esa.snap.core.util.ServiceFinder: Can’t search for SPIs, not a directory: /root/.snap/snap-python
INFO: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Loading external tools…
INFO: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Scanning for external tools adapters: /opt/snap/s1tbx
INFO: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Scanning for external tools adapters: /opt/snap/probavbox
INFO: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Scanning for external tools adapters: /opt/snap/s2tbx
INFO: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Scanning for external tools adapters: /opt/snap/java
SEVERE: org.esa.snap.core.gpf.operators.tooladapter.ToolAdapterIO: Failed scan for Tools descriptors: I/O problem: /opt/snap/java
SEVERE: org.esa.snap.core.datamodel.Product: first scan line left corner org.esa.snap.core.datamodel.GeoPos[38°10’45" N,122°18’04" W] not equal to org.esa.snap.core.datamodel.GeoPos[38°10’45" N,122°18’11" W]
SEVERE: org.esa.snap.core.datamodel.Product: first scan line left corner org.esa.snap.core.datamodel.GeoPos[38°10’45" N,122°18’04" W] not equal to org.esa.snap.core.datamodel.GeoPos[38°10’45" N,122°18’11" W]
org.esa.snap.core.gpf.graph.GraphException: [NodeId: WriteOp@ProductSet-Reader] Operator ‘WriteOp’: Mandatory source product (field ‘sourceProduct’) not set.
at org.esa.snap.core.gpf.graph.NodeContext.initTargetProduct(NodeContext.java:79)
at org.esa.snap.core.gpf.graph.GraphContext.initNodeContext(GraphContext.java:195)
at org.esa.snap.core.gpf.graph.GraphContext.initOutput(GraphContext.java:162)
at org.esa.snap.core.gpf.graph.GraphContext.(GraphContext.java:91)
at org.esa.snap.core.gpf.graph.GraphContext.(GraphContext.java:64)
at org.esa.snap.core.gpf.graph.GraphProcessor.executeGraph(GraphProcessor.java:130)
at org.esa.snap.core.gpf.main.DefaultCommandLineContext.executeGraph(DefaultCommandLineContext.java:84)
at org.esa.snap.core.gpf.main.CommandLineTool.executeGraph(CommandLineTool.java:498)
at org.esa.snap.core.gpf.main.CommandLineTool.runGraph(CommandLineTool.java:346)
at org.esa.snap.core.gpf.main.CommandLineTool.runGraphOrOperator(CommandLineTool.java:245)
at org.esa.snap.core.gpf.main.CommandLineTool.run(CommandLineTool.java:146)
at org.esa.snap.core.gpf.main.CommandLineTool.run(CommandLineTool.java:118)
at org.esa.snap.core.gpf.main.GPT.run(GPT.java:54)
at org.esa.snap.core.gpf.main.GPT.main(GPT.java:34)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.esa.snap.runtime.Launcher.lambda$run$0(Launcher.java:55)
at org.esa.snap.runtime.Engine.runClientCode(Engine.java:189)
at org.esa.snap.runtime.Launcher.run(Launcher.java:51)
at org.esa.snap.runtime.Launcher.main(Launcher.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:62)
at com.install4j.runtime.launcher.UnixLauncher.main(UnixLauncher.java:57)
Caused by: org.esa.snap.core.gpf.OperatorException: Operator ‘WriteOp’: Mandatory source product (field ‘sourceProduct’) not set.
at org.esa.snap.core.gpf.internal.OperatorContext.processSourceProductField(OperatorContext.java:938)
at org.esa.snap.core.gpf.internal.OperatorContext.initSourceProductFields(OperatorContext.java:902)
at org.esa.snap.core.gpf.internal.OperatorContext.initSourceProductFields(OperatorContext.java:894)
at org.esa.snap.core.gpf.internal.OperatorContext.initializeOperator(OperatorContext.java:482)
at org.esa.snap.core.gpf.internal.OperatorContext.getTargetProduct(OperatorContext.java:273)
at org.esa.snap.core.gpf.Operator.getTargetProduct(Operator.java:387)
at org.esa.snap.core.gpf.graph.NodeContext.initTargetProduct(NodeContext.java:77)
… 27 more

Error: [NodeId: WriteOp@ProductSet-Reader] Operator ‘WriteOp’: Mandatory source product (field ‘sourceProduct’) not set.
– org.jblas INFO Deleting /tmp/jblas1897199069081215309/libjblas.so
– org.jblas INFO Deleting /tmp/jblas1897199069081215309/libjblas_arch_flavor.so
– org.jblas INFO Deleting /tmp/jblas1897199069081215309
Coregister.xml (3.2 KB)