Object reference not set to an instance of an object.

[chen5410178]

at SSCMS.Core.StlParser.StlElement.StlPageContents.GetAsync(String stlPageContentsElement, IParseManager parseManager, Query query) in D:\a\1\s\build-win-x64\src\SSCMS.Core\StlParser\StlElement\StlPageContents.cs:line 52 at SSCMS.Web.Controllers.Stl.ActionsPageContentsController.Submit(SubmitRequest request) in D:\a\1\s\build-win-x64\src\SSCMS.Web\Controllers\Stl\ActionsPageContentsController.Submit.cs:line 33 at lambda_method92(Closure, Object) at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State

[starlying]

这个报错是什么操作出现的呢