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Error installing app

description

after executing install..
An unknown error has ocured during app installation. Read SharePoint log for more information

In SharePoint Logs i found this error.
4e9bfb1b-52ca-4b14-80b3-1c5f61860029 Stack trace:
at Microsoft.SharePoint.SPSecurableObject.DoesUserHavePermissions(SPBasePermissions permissionMask) 
at Microsoft.SharePoint.Administration.SPAppAdministrationSecurityContext.DemandReadRights(SPWeb web) 
at Microsoft.SharePoint.Administration.SPAppCatalog.GetAppInstances(SPWeb web) 
at Microsoft.SharePoint.Administration.SPAppCmdlets.GetSPAppInstanceCmdlet.GetAppInstancesBySite(SPWeb parentWeb, SPApp spApp) 
at Microsoft.SharePoint.Administration.SPAppCmdlets.GetSPAppInstanceCmdlet.RetrieveDataObjects() 
at Microsoft.SharePoint.PowerShell.SPGetCmdletBase`1.InternalProcessRecord() 
at Microsoft.SharePoint.PowerShell.SPCmdlet.ProcessRecord() 
at System.Management.Automation.CommandProcessor.ProcessRecord() 
at System.Management.Automation.CommandProcessorBase.DoExecute() 
at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input, Hashtable errorResults, Boolean enumerate) 
at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][] commandRedirections, FunctionContext funcContext) 
at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0) 
at System.Management.Automation.DlrScriptCommandProcessor.RunClause(Action`1 clause, Object dollarUnderbar, Object inputToProcess) 
at System.Management.Automation.CommandProcessorBase.DoComplete() 
at System.Management.Automation.Internal.PipelineProcessor.DoCompleteCore(CommandProcessorBase commandRequestingUpstreamCommandsToStop) 
at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input, Hashtable errorResults, Boolean enumerate) 
at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][] commandRedirections, FunctionContext funcContext) 
at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.Interpreter.Run(InterpretedFrame frame) 
at System.Management.Automation.Interpreter.LightLambda.RunVoid1[T0](T0 arg0) 
at System.Management.Automation.DlrScriptCommandProcessor.RunClause(Action`1 clause, Object dollarUnderbar, Object inputToProcess) 
at System.Management.Automation.CommandProcessorBase.DoComplete() 
at System.Management.Automation.Internal.PipelineProcessor.DoCompleteCore(CommandProcessorBase commandRequestingUpstreamCommandsToStop) 
at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input, Hashtable errorResults, Boolean enumerate) 
at System.Management.Automation.Runspaces.LocalPipeline.InvokeHelper() 
at System.Management.Automation.Runspaces.LocalPipeline.InvokeThreadProc() 
at System.Management.Automation.Runspaces.PipelineThread.WorkerProc() 
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
at System.Threading.ThreadHelper.ThreadStart()
I'm missing something?

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