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(1/1) InvalidArgumentException

invalid argument(s).

in ItemController.php line 215
at ItemController->fileDownload(object(Request), object(Proxy_Xpressengine_Plugins_ProductSpec_Handler))
at call_user_func_array(array(object(ItemController), 'fileDownload'), array(object(Request), object(Proxy_Xpressengine_Plugins_ProductSpec_Handler)))in Controller.php line 54
at Controller->callAction('fileDownload', array(object(Request), object(Proxy_Xpressengine_Plugins_ProductSpec_Handler)))in ControllerDispatcher.php line 45
at ControllerDispatcher->dispatch(object(Route), object(ItemController), 'fileDownload')in Route.php line 212
at Route->runController()in Route.php line 169
at Route->run()in Router.php line 658
at Router->Illuminate\Routing\{closure}(object(Request))in Pipeline.php line 30
at Pipeline->Illuminate\Routing\{closure}(object(Request))in Pipeline.php line 102
at Pipeline->then(object(Closure))in Router.php line 660
at Router->runRouteWithinStack(object(Route), object(Request))in Router.php line 635
at Router->runRoute(object(Request), object(Route))in Router.php line 601
at Router->dispatchToRoute(object(Request))in Router.php line 590
at Router->dispatch(object(Request))in Kernel.php line 176
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request))in Pipeline.php line 30
at Pipeline->Illuminate\Routing\{closure}(object(Request))in TrustProxies.php line 56
at TrustProxies->handle(object(Request), object(Closure))in Pipeline.php line 149
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request))in TransformsRequest.php line 30
at TransformsRequest->handle(object(Request), object(Closure))in Pipeline.php line 149
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request))in TransformsRequest.php line 30
at TransformsRequest->handle(object(Request), object(Closure))in Pipeline.php line 149
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request))in ValidatePostSize.php line 27
at ValidatePostSize->handle(object(Request), object(Closure))in Pipeline.php line 149
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request))in CheckForMaintenanceMode.php line 46
at CheckForMaintenanceMode->handle(object(Request), object(Closure))in Pipeline.php line 149
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request))in Pipeline.php line 102
at Pipeline->then(object(Closure))in Kernel.php line 151
at Kernel->sendRequestThroughRouter(object(Request))in Kernel.php line 116
at Kernel->handle(object(Request))in index.php line 75