C#•6mo ago

AspNetCore Null Exception

An unhandled exception has occurred while executing the request.
      System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
         at System.ArgumentNullException.Throw(String paramName)
         at System.IO.Path.Combine(String path1, String path2)
         at Rotativa.AspNetCore.WkhtmlDriver.Convert(String wkhtmlPath, String switches, String html, String wkhtmlExe)
         at Rotativa.AspNetCore.WkhtmltopdfDriver.ConvertHtml(String wkhtmltopdfPath, String switches, String html)
         at Rotativa.AspNetCore.ViewAsPdf.CallTheDriver(ActionContext context)
         at Rotativa.AspNetCore.AsResultBase.BuildFile(ActionContext context)
         at Rotativa.AspNetCore.AsResultBase.ExecuteResultAsync(ActionContext context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|30_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
      --- End of stack trace from previous location ---
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
         at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

An unhandled exception has occurred while executing the request.
      System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
         at System.ArgumentNullException.Throw(String paramName)
         at System.IO.Path.Combine(String path1, String path2)
         at Rotativa.AspNetCore.WkhtmlDriver.Convert(String wkhtmlPath, String switches, String html, String wkhtmlExe)
         at Rotativa.AspNetCore.WkhtmltopdfDriver.ConvertHtml(String wkhtmltopdfPath, String switches, String html)
         at Rotativa.AspNetCore.ViewAsPdf.CallTheDriver(ActionContext context)
         at Rotativa.AspNetCore.AsResultBase.BuildFile(ActionContext context)
         at Rotativa.AspNetCore.AsResultBase.ExecuteResultAsync(ActionContext context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|30_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
      --- End of stack trace from previous location ---
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
         at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

https://pastebin.com/BrnzgAPN Hi, As a beginner to ASP.NET Core Im developing a Contacts Manager application and I added a view for html to pdf conversion with Rotativa and attached the necessary exe file in wwwroot but im getting that giant error. How do i fix it?

2 Replies

Angius•6mo ago

path1 is null, wherever and whatever it is Use the debugger to figure out what Also, it might be a better idea to use something like QuestPDF for PDF generation, without involving HTML

!RushaanOP•6mo ago

okay its weird cuz the code is not telling me the line of the errror its working now after moving the the setup line of rotativa to above app.run in Program.cs, i did this before too but it started giving me error then even before starting the website and to overcome that error i moved it below the app.run but it gave the null exception i mentioned then, im not sure how it got fixed though

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AspNetCore Null Exception