Reinstalled PowerBI - error message: Feedback Type: Frown (Error) Error Message: Object reference

[Maz12]

Recently had to reimage my PC and reinstall Power BI.

When I tried to reopen a Power BI project, what i get is this error message: Object reference not set to an instance of an object:

Object not 

Feedback Type:
Frown (Error)

Error Message:
Object reference not set to an instance of an object.

Stack Trace:
at Microsoft.Mashup.Host.Document.PackageValidationResult.Merge(PackageValidationResult original, PackageValidationResult content)
at Microsoft.PowerBI.Client.Windows.Services.ReportFactory.CreateReportFromPowerBIPackage(IPowerBIPackage powerBIPackage, String pbixFilePath, Byte[] securityBindings, Boolean requiresConversionToReportLayout, PowerBIPackageOpenOptions options, IPowerBITelemetryService powerBITelemetryService, IAnalysisServicesService analysisServices, Version pbixFileVersion, PackageValidationResult& mashupValidationResult)
at Microsoft.PowerBI.Client.Windows.Services.PowerBIPackagingService.Open(FileStream fileStream, IPowerBIWindowService windowService, Nullable`1 entryPoint, PowerBIPackageOpenOptions options, ReportPreparerResult& prepareResult)
at Microsoft.PowerBI.Client.Windows.Services.FileManager.<LoadFromPbix>d__20.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.PowerBI.Client.Windows.Services.UIBlockingService.<>c__DisplayClass15_0`1.<<BlockUIAndRun>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.PowerBI.Client.Windows.Services.UIBlockingService.WaitOnUIThreadForTaskCompletion(Task task)
at Microsoft.PowerBI.Client.Windows.Services.UIBlockingService.BlockUIAndRun[T](Func`1 asyncMethod)
at Microsoft.PowerBI.Client.Windows.Services.FileManager.OpenFile(IPowerBIWindowService windowService, IPbixFile fileToOpen, Nullable`1 entryPoint)
at Microsoft.PowerBI.Client.Program.TryOpenOrCreateReport(IUIHost uiHost, ISplashScreen splashScreen, IFileManager fileManager, IFileHistoryManager fileHistoryManager, String filePath, FileType fileType)
at Microsoft.PowerBI.Client.Program.<>c__DisplayClass2_0.<Main>b__1()
at Microsoft.PowerBI.Client.Windows.IExceptionHandlerExtensions.<>c__DisplayClass3_0.<HandleExceptionsWithNestedTasks>b__0()
at Microsoft.Mashup.Host.Document.ExceptionHandlerExtensions.HandleExceptions(IExceptionHandler exceptionHandler, Action action)

Stack Trace Message:
Object reference not set to an instance of an object.

Invocation Stack Trace:
at Microsoft.Mashup.Host.Document.ExceptionExtensions.GetCurrentInvocationStackTrace()
at Microsoft.Mashup.Client.UI.Shared.StackTraceInfo..ctor(String exceptionStackTrace, String invocationStackTrace, String exceptionMessage)
at Microsoft.PowerBI.Client.Windows.Telemetry.PowerBIUserFeedbackServices.GetStackTraceInfo(Exception e)
at Microsoft.PowerBI.Client.Windows.Telemetry.PowerBIUserFeedbackServices.ReportException(IWindowHandle activeWindow, IUIHost uiHost, FeedbackPackageInfo feedbackPackageInfo, Exception e, Boolean useGDICapture)
at Microsoft.Mashup.Client.UI.Shared.UnexpectedExceptionHandler.<>c__DisplayClass14_0.<HandleException>b__0()
at Microsoft.Mashup.Client.UI.Shared.UnexpectedExceptionHandler.HandleException(Exception e)
at Microsoft.Mashup.Host.Document.ExceptionHandlerExtensions.HandleExceptions(IExceptionHandler exceptionHandler, Action action)
at Microsoft.PowerBI.Client.Program.Main(String[] args)

[v-chuncz-msft]

@Maz12 

You may check the links below.

• https://docs.microsoft.com/en-us/power-bi/connect-data/desktop-error-launching-desktop
• https://docs.microsoft.com/en-us/power-bi/connect-data/desktop-connect-oracle-database#troubleshooti...