2020-03-16 19:31:57,090 : ERROR : KNIME-Worker-167-Python Learner 0:22 :  : Node : Python Learner : 0:22 : Execute failed: The requested buffersize during serialization exceeds the maximum buffer size. Please consider decreasing the 'Rows per chunk' parameter in the 'Options' tab of the configuration dialog.
org.knime.python2.kernel.PythonIOException: The requested buffersize during serialization exceeds the maximum buffer size. Please consider decreasing the 'Rows per chunk' parameter in the 'Options' tab of the configuration dialog.
	at org.knime.python2.util.PythonUtils$Misc.executeCancelable(PythonUtils.java:265)
	at org.knime.python2.kernel.PythonKernel.getObject(PythonKernel.java:993)
	at org.knime.python2.nodes.learner2.PythonLearnerNodeModel2.execute(PythonLearnerNodeModel2.java:93)
	at org.knime.core.node.NodeModel.executeModel(NodeModel.java:571)
	at org.knime.core.node.Node.invokeFullyNodeModelExecute(Node.java:1236)
	at org.knime.core.node.Node.execute(Node.java:1016)
	at org.knime.core.node.workflow.NativeNodeContainer.performExecuteNode(NativeNodeContainer.java:557)
	at org.knime.core.node.exec.LocalNodeExecutionJob.mainExecute(LocalNodeExecutionJob.java:95)
	at org.knime.core.node.workflow.NodeExecutionJob.internalRun(NodeExecutionJob.java:218)
	at org.knime.core.node.workflow.NodeExecutionJob.run(NodeExecutionJob.java:124)
	at org.knime.core.util.ThreadUtils$RunnableWithContextImpl.runWithContext(ThreadUtils.java:334)
	at org.knime.core.util.ThreadUtils$RunnableWithContext.run(ThreadUtils.java:210)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at org.knime.core.util.ThreadPool$MyFuture.run(ThreadPool.java:123)
	at org.knime.core.util.ThreadPool$Worker.run(ThreadPool.java:246)
Caused by: org.knime.python2.kernel.PythonIOException: The requested buffersize during serialization exceeds the maximum buffer size. Please consider decreasing the 'Rows per chunk' parameter in the 'Options' tab of the configuration dialog.
	at org.knime.python2.kernel.messaging.AbstractTaskHandler.handleFailureMessage(AbstractTaskHandler.java:146)
	at org.knime.python2.kernel.messaging.AbstractTaskHandler.handle(AbstractTaskHandler.java:92)
	at org.knime.python2.kernel.messaging.DefaultTaskFactory$DefaultTask.runInternal(DefaultTaskFactory.java:256)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: Traceback (most recent call last):
  File "C:\Program Files\KNIME\plugins\org.knime.python2.serde.flatbuffers_4.1.0.v201908271559\py\Flatbuffers.py", line 810, in table_to_bytes
    bytesOffsets.append(get_ByteCell(builder, col[idx]))
  File "C:\Program Files\KNIME\plugins\org.knime.python2.serde.flatbuffers_4.1.0.v201908271559\py\Flatbuffers.py", line 976, in get_ByteCell
    bytesVec = builder.CreateByteArray(cell)
  File "C:\Program Files\KNIME\plugins\org.knime.python2.serde.flatbuffers_4.1.0.v201908271559\py\flatbuffers\builder.py", line 434, in CreateByteArray
    self.Prep(N.UOffsetTFlags.bytewidth, (len(x)+1)*N.Uint8Flags.bytewidth)
  File "C:\Program Files\KNIME\plugins\org.knime.python2.serde.flatbuffers_4.1.0.v201908271559\py\flatbuffers\builder.py", line 333, in Prep
    self.growByteBuffer()
  File "C:\Program Files\KNIME\plugins\org.knime.python2.serde.flatbuffers_4.1.0.v201908271559\py\flatbuffers\builder.py", line 282, in growByteBuffer
    raise BuilderSizeError(msg)
flatbuffers.builder.BuilderSizeError: flatbuffers: cannot grow buffer beyond 2 gigabytes

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files\KNIME\plugins\org.knime.python2_4.1.0.v201911191126\py\messaging\RequestHandlers.py", line 96, in _handle_custom_message
    response = self._respond(message, response_message_id, workspace)
  File "C:\Program Files\KNIME\plugins\org.knime.python2_4.1.0.v201911191126\py\messaging\RequestHandlers.py", line 245, in _respond
    data_bytes = workspace.serializer.data_frame_to_bytes(data_frame)
  File "C:\Program Files\KNIME\plugins\org.knime.python2_4.1.0.v201911191126\py\Serializer.py", line 205, in data_frame_to_bytes
    data_bytes = self._serialization_library.table_to_bytes(table)
  File "C:\Program Files\KNIME\plugins\org.knime.python2.serde.flatbuffers_4.1.0.v201908271559\py\Flatbuffers.py", line 966, in table_to_bytes
    raise BufferError("The requested buffersize during serialization exceeds the maximum buffer size."
BufferError: The requested buffersize during serialization exceeds the maximum buffer size. Please consider decreasing the 'Rows per chunk' parameter in the 'Options' tab of the configuration dialog.