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I am currently facing an issue with the Digitize Document activity in a process on UiPath. I am using the UiPath.IntelligentOCR.Activities package activities with the Abbyy OCR Engine. When I run this, I get the message "Unexpected Error has occured". The exception message will be at the bottom of this post. 

This issue only seems to occur when using the Abbyy OCR engine, whilst the rest scrape no data from the forms I am attempting to read. There are no clear solutions on the UiPath Forums and I cannot figure out why this is not working. Does anybody know how to resolve the issue? Any help is appriciated. 

Link to UiPath Forum post: https://forum.uipath.com/t/unexpected-error-in-digitize-document-activity/263158

Error message log: 

20.4.1

Source: Digitize Document

Message: An unexpected error has occurred

Exception Type: System.Exception

RemoteException wrapping System.Exception: An unexpected error has occurred ---> RemoteException wrapping System.AggregateException: One or more errors occurred. ---> RemoteException wrapping UiPath.SmartData.Digitization.Tokenization.TokenizationException: IMCA form 11.pdf_Page_3 ---> RemoteException wrapping System.Exception: Error performing OCR: Retrieving the COM class factory for component with CLSID {110020D2-0000-1056-976E-008048D53AE3} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)). AbbyyErrorNotInstalled ---> RemoteException wrapping System.ServiceModel.FaultException: Retrieving the COM class factory for component with CLSID {110020D2-0000-1056-976E-008048D53AE3} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)). AbbyyErrorNotInstalled
at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
at System.ServiceModel.Channels.ServiceChannelProxy.TaskCreator.<>c__DisplayClass7_0`1.<CreateGenericTask>b__0(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Vision.VisionClient.<ScrapeAsync>d__5.MoveNext()
--- End of inner exception stack trace ---
at UiPath.Vision.VisionClient.<ScrapeAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Abbyy.Core.AbbyyScraper.<ScrapeOCRAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Abbyy.Activities.UiImage.<ScrapeOCRAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Abbyy.Activities.OCREngineActivity.<ExecuteAsync>d__50.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at UiPath.Shared.Activities.AsyncTaskCodeActivityImplementation.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
at UiPath.Abbyy.Activities.OCREngineAsyncTaskCodeActivity.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)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.IntelligentOCR.Digitization.ExtendedOcrEngineActivityWrapper.<Execute>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.SmartData.Digitization.OCR.OcrTokenizer.<TokenizeAsync>d__7.MoveNext()
--- End of inner exception stack trace ---
at UiPath.SmartData.Digitization.OCR.OcrTokenizer.<TokenizeAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.SmartData.Digitization.PDF.PdfTokenizer.<TokenizePageImage>d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.SmartData.Digitization.PDF.PdfTokenizer.<ProcessPageDocument>d__11.MoveNext()
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at System.Threading.Tasks.Task`1.get_Result()
at UiPath.SmartData.Digitization.ContentTokenizer.<>c__DisplayClass8_0.<TokenizePage>b__0(Task`1 t)
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.SmartData.Digitization.DocumentDigitizer.<DigitizeAsync>d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.IntelligentOCR.Activities.Digitization.DigitizeDocument.<ExecuteAsync>d__34.MoveNext()
--- End of inner exception stack trace ---
at UiPath.Shared.Activities.AsyncTaskNativeImplementation.BookmarkResumptionCallback(NativeActivityContext context, Object value)
at UiPath.Shared.Activities.AsyncTaskNativeActivity.BookmarkResumptionCallback(NativeActivityContext context, Bookmark bookmark, Object value)
at System.Activities.Runtime.BookmarkCallbackWrapper.Invoke(NativeActivityContext context, Bookmark bookmark, Object value)
at System.Activities.Runtime.BookmarkWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)