# OPC DCOM write error

**URL:** <https://forum.inductiveautomation.com/t/opc-dcom-write-error/15204>\
**Category:** Ignition\
**Created:** [August 30, 2017, 6:10pm UTC](https://forum.inductiveautomation.com/t/opc-dcom-write-error/15204 "2017-08-30T18:10:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![roshanbhosale](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/roshanbhosale/32/4899_2.png) [@roshanbhosale](https://forum.inductiveautomation.com/u/roshanbhosale)\
**Post date:** [August 30, 2017, 6:10pm UTC](https://forum.inductiveautomation.com/t/opc-dcom-write-error/15204/1 "2017-08-30T18:10:35Z")

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Hi, everyone  
I am facing the following problem when trying to write to the MFX’s MCO1OPC server.  
I am getting following error in log file.  
What may be the cause of such issue?

```auto
INFO | jvm 1 | 2017/08/30 16:17:58 | ERROR [COMSubscription] [16:17:58,285]: Error executing write to OPC-COM items.
INFO | jvm 1 | 2017/08/30 16:17:58 | java.lang.NullPointerException
INFO | jvm 1 | 2017/08/30 16:17:58 | at com.jniwrapper.PrimitiveArray.<init>(SourceFile:88)
INFO | jvm 1 | 2017/08/30 16:17:58 | at com.inductiveautomation.opccom.wrapper.subscriptions.COMSubscription$AsyncWriteJob.oleloop_startWrite(COMSubscription.java:1484)
INFO | jvm 1 | 2017/08/30 16:17:58 | at com.inductiveautomation.opccom.wrapper.subscriptions.COMSubscription$WriteJob.internalRun(COMSubscription.java:1338)
INFO | jvm 1 | 2017/08/30 16:17:58 | at com.inductiveautomation.opccom.wrapper.OleJob.run(OleJob.java:47)
INFO | jvm 1 | 2017/08/30 16:17:58 | at com.jniwrapper.win32.MessageLoopThread$ThreadSynchronizedAction.run(MessageLoopThread.java:620)
INFO | jvm 1 | 2017/08/30 16:17:58 | at com.jniwrapper.win32.MessageLoopThread$LoopThread.run(MessageLoopThread.java:562)
INFO | jvm 1 | 2017/08/30 16:17:58 | ERROR [Provider[TAS_D] ] [16:17:58,287]: [[TAS_D]LOADING_SEQ/Loading_Seq_BC_5/Transaction_Qty] Error writing to OPC address [[MFX4 system]GANTRY4_5.CUT.CANBus.MeterModule_G5.ODMnf.2425-ProcessControl1.D-TransactionQuantity]. Result code: [INTERNAL_ERROR] null
INFO | jvm 1 | 2017/08/30 16:17:58 | ERROR [Provider[TAS_D] ] [16:17:58,287]: [[TAS_D]LOADING_SEQ/Loading_Seq_BC_5/Command] Error writing to OPC address [[MFX4 system]GANTRY4_5.CUT.CANBus.MeterModule_G5.ODMnf.2425-ProcessControl1.B-Command]. Result code: [INTERNAL_ERROR] null

```

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<div class="post-metadata">

**Author:** ![roshanbhosale](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/roshanbhosale/32/4899_2.png) [@roshanbhosale](https://forum.inductiveautomation.com/u/roshanbhosale)\
**Post date:** [September 11, 2017, 1:31pm UTC](https://forum.inductiveautomation.com/t/opc-dcom-write-error/15204/2 "2017-09-11T13:31:34Z")

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what will be the reason for:

`java.lang.NullPointerException`  
and  
`Result code: [INTERNAL_ERROR] null`