Error: One or more errors occurred.

I also see this error in the RSPortal log:

RSPortal!reportserverwebapp!RSPortal.exe!5d5!01/02/2018-10:36:15:: i INFO: Received request POST /api/v2.0/catalogitems | RequestID = s_694261c5-338d-4f4d-933a-95f79983777e
RSPortal!reportserverwebapp!RSPortal.exe!5d5!01/02/2018-10:36:16:: e ERROR: OData exception occurred: Microsoft.BIServer.HostingEnvironment.Cryptography.Exceptions.CannotValidateEncryptedDataException: Exception of type 'Microsoft.BIServer.HostingEnvironment.Cryptography.Exceptions.CannotValidateEncryptedDataException' was thrown.
   at Microsoft.BIServer.HostingEnvironment.Cryptography.SymmetricKeyCrypto.EncryptInternal(Byte[] data)
   at Microsoft.BIServer.HostingEnvironment.Cryptography.Crypto.Encrypt(Byte[] unprotectedData, String tag)
   at Microsoft.ReportingServices.Portal.Repositories.CatalogItemRepository.SetDataModelDataSourcesTrusted(IPrincipal userPrincipal, Guid itemId, IEnumerable`1 dataSources, Boolean isOverwrite)
   at Microsoft.ReportingServices.Portal.Repositories.CatalogItemRepository.CreatePowerBIReport(RSService rsService, IPrincipal userPrincipal, String parentPath, Boolean overwrite, PowerBIReport item, Property[] properties)
   at Microsoft.ReportingServices.Portal.Repositories.CatalogItemRepository.CreateItem(IPrincipal userPrincipal, CatalogItem catalogItem, CatalogItem& createdItem)
   at Microsoft.ReportingServices.Portal.ODataWebApi.V2.Controllers.CatalogItemsController.AddEntity(CatalogItem entity, CatalogItem& createdEntity)
   at Microsoft.ReportingServices.Portal.ODataWebApi.Controllers.Reflection.EntitySetReflectionODataController`1.Post(ODataPath oDataPath, T value)
   at lambda_method(Closure , Object , Object[] )
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
--- 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 System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.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 System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.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 System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__0.MoveNext(). | RequestID = s_694261c5-338d-4f4d-933a-95f79983777e