Error waiting for host service with OCR

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Hello.

I was trying to perform the 'Read PDF with OCR" activity but suddenly got an error:

System.Exception: Error waiting for host service. Timeout: 30000

I’ve never ever had this issue before. The full description of this is here:

Main has thrown an exception

Source: Microsoft OCR

Message: Error waiting for host service. Timeout: 30000

Exception Type: Exception

System.Exception: Error waiting for host service. Timeout: 30000

Server stack trace: 
at UiPath.Vision.Hosting.LocalHostClient.StartHostService(Int32 timeout)
at UiPath.Vision.Hosting.LocalHostClient.CreateHostServiceProxy(Boolean force, Int32 timeout, String endPoint)
at UiPath.Vision.VisionProcessor.CreateServiceProxy(Int32 timeout, Boolean force, HostingArchitecture processorArchitecture, String endPointName)
at UiPath.Vision.VisionProcessor.ScrapeUsingHostService(OCRInput input, OCROptions options, CancellationToken cancelToken)
at UiPath.Vision.VisionProcessor.Scrape(OCRInput input, OCROptions options, CancellationToken cancelToken, Boolean useHostProcess)
at UiPath.Vision.UiImage.ScrapeOCR(OCROptions options, CancellationToken cancellationToken)
at UiPath.Core.Activities.OCREngineActivity.<>c__DisplayClass36_0.<BeginExecute>b__0()
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)

Exception rethrown at [0]: 
at System.Runtime.Remoting.Proxies.RealProxy.EndInvokeHelper(Message reqMsg, Boolean bProxyCase)
at System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(Object NotUsed, MessageData& msgData)
at System.Func`1.EndInvoke(IAsyncResult result)
at UiPath.Core.Activities.OCREngineActivity.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity`1.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)
2
  • When you are using Microsoft OCR:-
    There are few prerequisites for using Microsoft OCR.

To use the Microsoft OCR you need to install MODI.
The MODI is a component of Sharepoint Designer 2007. You can directly download it from here: https://www.microsoft.com/en-us/download/details.aspx?id=21581
After you install it, you can restart UiPath Studio and MODI should be available.

Attached some documents for reference.
- https://forum.uipath.com/t/missing-microsoft-ocr-in-screen-scraping-wizard/6584/3
- https://forum.uipath.com/t/ocr-microsoft-ocr-cloud-ocr-abby-ocr-giving-same-error-invalidimageinput/472/15
- https://forum.uipath.com/t/uipath-install-ms-office-ocr/89/2

Could you please confirm if the language pack has been installed properly by following the below links,

https://support.lenovo.com/lu/en/solutions/ht069387

1 Like
3

Hi,
I’m facing a problem with microsoft OCR and I must use OCR to extract data in a process.
I’m trying to extract text from picture, but Extract text from screen activity always return an OCR method failed to scrape this UIElement after timeout.
image

MODI is installed and effective. I can use it in Onenote 2016.

The machine on which this problem occurs is not connected to internet, can it be a reason of failure ?

Please, someone can help me?
I have no idea of what to do now

4
  1. What is the OS version?
  2. Can you try installing Sharepoint Designer 2007 and then check the behaviour