Model Builder Error : Unable to find method 'StartTrainingAsync/1' on {no object}

[gerwintmg]

System Information (please complete the following information):

• Model Builder Version : 16.6.0.2130907
• Visual Studio Version: Microsoft Visual Studio Community 2019 Version 16.10.2

Describe the bug

• On which step of the process did you run into an issue:
  I Pressed the "Start training" butten

• Clear description of the problem:
  Model Builder Error
  Unable to find method 'StartTrainingAsync/1' on {no object} for the following reasons: Deserializing JSON-RPC argument with name "config" and position 0 to type "System.String" failed: Error reading string. Unexpected token: StartObject. Path 'params[0]', line 6, position 5

To Reproduce
Steps to reproduce the behavior:

1. Go to Project context menu -> Add -> Machine learning
2. Click "Image Classification"
3. Select Training images mine where located in "C:\temp.."
4. Click "Train" button
5. Select "Local"
6. Click "Start training"
7. ERROR..

Expected behavior
I expected to start model training..

Screenshots
If applicable, add screenshots to help explain your problem.

[LittleLittleCloud]

@JakeRadMSFT could it be something similar to #1513, except that the null object is training config?

@gerwintmg Could you give it a second try and see if the error still exists? If the error is still there, can we get the service hub log on your machine? You can find it through following steps

• close VS
• go to %temp%servicehub folder and delete logs
• set ServiceHubTraceLevel to All in environment
• reopen VS and model builder, and launch the same experiment
• go to %temp%servicehub\logs folder and you should see a bunch of log files, please zip and upload it.

Regards

[gerwintmg]

@LittleLittleCloud
the second try gives the same error.

These are 2 of the logs I got.

EFF85C23-MicrosoftMLModelBuilderAutoML-14824-eupctufw-1.log
EFF85C23-CreateAutoMLServiceAsync-26468-q3rdfaty-1.log

[LittleLittleCloud]

Thanks @gerwintmg , We are taking a look!

[LittleLittleCloud]

Hi @gerwintmg
We might need more logs from servicehub,, can you try the previous steps again and this time just zip the entire log folder and upload here? Thanks!

[gerwintmg]

logs.zip

Hope this helps :)

[MikeSifanele]

@LittleLittleCloud I also experienced the same issue. I uninstalled the ML.NET Model Builder GPU Support (Preview) and I started working/training.

[LittleLittleCloud]

@MikeSifanele

Thanks for the info, are you using image classification when the error appears?

[LittleLittleCloud]

Hi @gerwintmg , Thank for the log. It still misses verbose log though, can you check if ServiceHubTraceLevel is set to All in System variables?

And you will need to restart VS after setting that variable as well. After that, you should see different level of logs(verbose/information...) in log file.

[MikeSifanele]

@LittleLittleCloud No, I was using the value prediction scenario.

[gerwintmg]

I did "set ServiceHubTraceLevel All" in Powershell and it was valid... (set is a alias of Set-Variable)

So now with powershell:

[System.Environment]::SetEnvironmentVariable('ServiceHubTraceLevel','All',[System.EnvironmentVariableTarget]::User)

and here are new log: (no zip with all logs as some logs contained tokens, close to authentication)

C1F86FFE-MicrosoftMLModelBuilderAutoML-8548-byh5vjhq-1.log
C1F86FFE-MicrosoftMLModelBuilderAutoML-8548-cahsgb4t-1.log
C1F86FFE-CreateAutoMLServiceAsync-hubControllerLookup-21824-adyc4en5-1.log
C1F86FFE-CreateAutoMLServiceAsync-hubControllerLookup-21824-feouxsnc-1.log
C1F86FFE-CreateAutoMLServiceAsync-hubControllerLookup-21824-nwcy3jpq-1.log
C1F86FFE-CreateAutoMLServiceAsync-21824-pabajwtk-1.log
C1F86FFE-CreateAutoMLServiceAsync-hubControllerLookup-21824-25hbwe2v-1.log

[LittleLittleCloud]

Hi @gerwintmg
Thanks for the trace logs! It's of great help to us debugging the problem you encountered.

Based on the log, it seems that the error is caused by an older ModelBuilder call into a newer version of AutoML service, which has a different signature of StartTrainingAsync. And also it looks like your model builder is not latest because of the missing of GPU training. (see below for GPU training UI) Maybe the model builder extension is not updated correctly. It's also possible that something got GAC’d at some point and so an older version of the assembly ends up getting loaded.

Could you do us a favor by uninstalling modelbuilder first, then re-install it from market place. The latest version should be 16.6.1. And see if this problem go away? Since in the latest version, we shift to a config-base training, and you can use this to validate if your model builder is up-to-date

[LittleLittleCloud]

@gerwintmg
Any updates on this issue

[LittleLittleCloud]

@gerwintmg

we assume that the reinstallation successfully solve this issue as there's no response, feel free to reopen it and @ me if it's not.