# \[BUG\] Clicking on OPC UA SERVER, Device Connections Internal Error **URL:** \ **Category:** Ignition Early Access\ **Created:** [January 25, 2019, 2:30am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112 "2019-01-25T02:30:56Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Sam.Bartlett](https://avatars.discourse-cdn.com/v4/letter/s/d07c76/32.png) [@Sam.Bartlett](https://forum.inductiveautomation.com/u/Sam.Bartlett)\ **Post date:** [January 25, 2019, 2:30am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/1 "2019-01-25T02:30:56Z")
When clicking on the Device Connections section in the config window I’m given an ‘Internal Error’ message. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/3/3cbd306ebd58e83deb384be78cb476f5dbae57c5.png) In the logs an error is given, DefaultExceptionMapper( mouseover: org.apache.wicket.DefaultExceptionMapper) Log is attached. There are currently two modbus devices configured, one disabled and the other configured for a remote connection to a public IP (which as far as I can tell is working correctly, before and after the internal error message was given). The error started when I added an address mapping to the enabled device. Edit (10m): It looks as though I cannot read any tag values. If I stop and start the gateway I can access the device connection page once, if I leave the page I cannot return, the same error is given, if I click to edit one of the devices results in the same as well. After restarting the gateway for a third time, I can now not access the gateway homepage either. [MobusDevice Error.txt](https://us1.discourse-cdn.com/inductiveautomation/original/2X/4/4192bb3cb387a40462a32e79ab159ab96b0b6643.txt) (12.5 KB) ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [January 25, 2019, 2:48am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/2 "2019-01-25T02:48:48Z")
Thanks, I can’t reproduce this but I’ve taken a stab at fixing it based on the stack trace. Unfortunately you won’t be able to test it out until we start releasing nightly builds again. ---
**Author:** ![Sam.Bartlett](https://avatars.discourse-cdn.com/v4/letter/s/d07c76/32.png) [@Sam.Bartlett](https://forum.inductiveautomation.com/u/Sam.Bartlett)\ **Post date:** [January 25, 2019, 3:13am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/3 "2019-01-25T03:13:10Z")
Thank-you Kevin, I’ve temporarily downgraded to v7.9.10. I look forward to the next update 🙂 ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [January 25, 2019, 3:15am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/4 "2019-01-25T03:15:46Z")
Use a dev system or VM for the next one! ---
**Author:** ![awalker](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/awalker/32/6874_2.png) [@awalker](https://forum.inductiveautomation.com/u/awalker)\ **Post date:** [February 8, 2019, 9:39pm UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/5 "2019-02-08T21:39:57Z")
This issue should be fixed in the newest build. Let us know if you continue to see this behavior after upgrading. ---
**Author:** ![1264034959](https://avatars.discourse-cdn.com/v4/letter/1/bcef8e/32.png) [@1264034959](https://forum.inductiveautomation.com/u/1264034959)\ **Post date:** [July 5, 2019, 6:59am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/6 "2019-07-05T06:59:16Z")
When clicking on the Device Connections section in the config window, I’m given an ‘Internal Error’ message, too. I import many .csv files configuration for device address, but just two of them could not be saved. ---
**Author:** ![1264034959](https://avatars.discourse-cdn.com/v4/letter/1/bcef8e/32.png) [@1264034959](https://forum.inductiveautomation.com/u/1264034959)\ **Post date:** [July 5, 2019, 10:16am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/7 "2019-07-05T10:16:02Z")
The version I used is Ignition 8.0.2. And I did a test during address configration——If the .CSV file has more than 685 rows, it cannot be imported. Is there a line limit for imported files? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [July 5, 2019, 3:25pm UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/8 "2019-07-05T15:25:26Z")
It’s not an explicit line limit but a size limit. The address mapping you create is essentially stored as an encoded CSV file inside the internal database, and we don’t want to make a single table prohibitively large, so, at least for now, the filesize limit is fairly restrictive. You can confirm on Gateway -\> Status -\> Logs - every time you hit the “Internal Error” page, there should be an error logged by `DefaultExceptionMapper` that gives you some information about what the error was. An _option_ to explore if you want to just create the tags from your existing address mapping; I wrote this script a _while_ back to open address mapping .csv files and print out a sequence of OPC item paths, which you could then fairly easy use in a CSV _tag_ import - you just have to provide a naming convention: ```python import csv inputfile = system.file.openFile("csv") device = system.gui.inputBox("Enter device name") f = open(inputfile, 'r') csvfile = csv.reader(f) types = { 'HoldingRegisterInt16':'HR', 'HoldingRegisterFloat':'HRF', 'HoldingRegisterDouble':'HRD', 'HoldingRegisterUInt16':'HRUS', 'HoldingRegisterInt32':'HRI', 'HoldingRegisterUInt32':'HRUI', 'HoldingRegisterInt64':'HR_64', 'HoldingRegisterUInt64':'HRUI_64', 'HoldingRegisterBcd':'HRBCD', 'HoldingRegisterBcd32':'HRBCD_32', 'InputRegisterInt16':'IR', 'InputRegisterFloat':'IRF', 'InputRegisterDouble':'IRD', 'InputRegisterUInt16':'IRUS', 'InputRegisterInt32':'IRI', 'InputRegisterUInt32':'IRUI', 'InputRegisterInt64':'IR_64', 'InputRegisterUInt64':'IRUI_64', 'InputRegisterBcd':'IRBCD', 'InputRegisterBcd32':'IRBCD_32', 'DiscreteInput':'DI', 'Coil':'C', 'ULONG': 'HRUI' } radix = 10 paths = [] for row in csvfile: if row[1] == '': radix = row[0] else: for i in range(int(row[1]), int(row[2])): paths.append("[%s]%s.%s%s" % ( device, row[4], #unitid types[row[5]], #register type int(row[6]) + i ) ) f.close() print '\r\n'.join(paths) ``` ---
**Author:** ![1264034959](https://avatars.discourse-cdn.com/v4/letter/1/bcef8e/32.png) [@1264034959](https://forum.inductiveautomation.com/u/1264034959)\ **Post date:** [July 8, 2019, 2:59am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/10 "2019-07-08T02:59:08Z")
could u please tell me about the size limit? The two .csv file sizes are 31KB and 34KB, respectively. ---
**Author:** ![agavino](https://avatars.discourse-cdn.com/v4/letter/a/3d9bf3/32.png) [@agavino](https://forum.inductiveautomation.com/u/agavino)\ **Post date:** [May 19, 2021, 11:10am UTC](https://forum.inductiveautomation.com/t/bug-clicking-on-opc-ua-server-device-connections-internal-error/22112/11 "2021-05-19T11:10:14Z")
Hello I have the same problem, did you resolve this? thanks