See the logfile:

 

[iNFO - 7:20:01 PM] [Log] Started

[iNFO - 7:20:01 PM] [Main] Main: Initializing...
[iNFO - 7:20:01 PM] [Main] Main: LCPDFR Engine © 2011-2013 LMS
[iNFO - 7:20:01 PM] [Main] Main: DO NOT USE THIS WITHOUT PERMISSION. YOU MAY NOT SHARE, MODIFY OR DECOMPILE THIS FILE.
[iNFO - 7:20:02 PM] [PluginManager] Initialize: Loading custom plugins
[WARNING - 7:20:02 PM] [settings] ReadSettings: Invalid entry
[iNFO - 7:20:02 PM] [settings] ReadSettings: Suspect transporter POLICE
[iNFO - 7:20:02 PM] [settings] ReadSettings: Suspect transporter POLICE2
[iNFO - 7:20:02 PM] [settings] ReadSettings: Suspect transporter PSTOCKADE
[WARNING - 7:20:02 PM] [settings] ReadSettings: Invalid entry
[WARNING - 7:20:02 PM] [settingsFile] GetValue: Value not found: PreloadAllModels (Main)
[WARNING - 7:20:02 PM] [settingsFile] GetValue: Value not found: UsingPoliceStationMod (Main)
[iNFO - 7:20:02 PM] [Main] Main: Initializing done
[iNFO - 19:20:02] [serverCommunication] InitializeConnection: Internet connection available
[ERROR - 19:20:02] [serverCommunication] GetPublicIP: Error when using local internet gateway as UPnP device: Eine vorhandene Verbindung wurde vom Remotehost geschlossen
[iNFO - 19:20:03] [stats] CollectSystemInformation: Server stats updated
[iNFO - 19:20:06] [serverCommunication] InitializeConnection: Public IP Address is: 84.119.140.164
[iNFO - 19:20:06] [serverCommunication] InitializeConnection: Connected to the LCPDFR server
[iNFO - 19:20:11] [NetworkManager] NetworkManager: In network session: False Is host: False
[iNFO - 19:20:11] [Authentication] Authentication: Server available, using online authentication
[ERROR - 19:20:12] [Authentication] Authentication: Error 0x320
[ERROR - 19:20:12] [Authentication] Authentication: Authentication failed
[iNFO - 19:20:12] [Authentication] Authentication: Failed to authenticate
[iNFO - 19:22:40] [updateCheck] DoUpdateCheck: Checking for updates
[iNFO - 19:22:40] [updateCheck] DoUpdateCheck: No updates available
[WARNING - 7:25:05 PM] [ContentManager] AddPed: Ped already has a non-default content manager. It's recommended to properly reset the content manager, before changing
[WARNING - 7:29:43 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:29:43 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:29:43 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:29:43 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:32:34 PM] [scenarioCopPullover] Initialize: Failed to create driver
[WARNING - 19:32:41] [AudioDatabase] GetAudioFileForAction: No file found for: LORIMAR_ST
[WARNING - 7:44:22 PM] [script.Disturbance] OnCalloutAccepted: Failed to spawn at least one ped
[WARNING - 7:46:55 PM] [ContentManager] AddPed: Ped already has a non-default content manager. It's recommended to properly reset the content manager, before changing
[WARNING - 7:49:41 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:49:41 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:49:41 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:49:41 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[WARNING - 7:49:41 PM] [soundEngine] PlayExternalSound: IO error while opening wave stream from C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioResidentAmb_ResidentTASER_DEPLOY.wav. File already in use?
[ERROR - 7:53:43 PM] [] Error while processing script: AmbientScenarioManager: Object reference not set to an instance of an object.   at freval_258.eval_fr2(freval_202 A_0)
   at freval_91.eval_fr20(Vector3 A_0)
   at freval_137.eval_fr0(String A_0, Vector3 A_1)
   at freval_137.fr0()
   at freval_137.Process()
   at LCPD_First_Response.Engine.Scripting.Plugins.ScriptManager.Process()
[WARNING - 7:57:50 PM] [AudioHelper] formattedStreet Union_Drive_West
[WARNING - 7:57:50 PM] [AudioHelper] audioFilePath C:SpieleGTA IVGrand Theft Auto IVlcpdfrAudioPoliceScannerStreetsUNION_DRIVE_WEST.wav
[WARNING - 7:57:50 PM] [AudioHelper] streetName Union_Drive_West
[ERROR - 8:01:09 PM] [PluginManager] Unhandled exception caught while processing plugin: Main. Plugin will no longer be executed.
[ERROR - 8:01:09 PM] [Plugin.Main] System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at freval_36.OnCalloutAccepted()
   at freval_129.Process()
   at freval_2.Process()
   at freval_10.fr1()

Hello, can you post a screenshot of your GTA IV directory? 

Here it is.

I see you have the freval error. The freval error was fixed for some users by doing this: Open up your LCPDFR.ini, look under "Main", it should look something like this by default:

[Main]
AdditionalCopCarModels=
SuspectTransporterModels=POLICE;POLICE2;PSTOCKADE;
VehicleTrunkWeapons=Shotgun_Baretta;
AllTextMode=False
AmbientScenariosMaximum=2
AmbientScenariosMultiplier=250
DepartmentName=Liberty City Police Department
DepartmentShortName=LCPD
FirstStart=True
UsingPoliceStationMod=False

Now, add to the bottom of that part

PreloadAllModels=True

The "Main" part should now look like this:

[Main]
AdditionalCopCarModels=
SuspectTransporterModels=POLICE;POLICE2;PSTOCKADE;
VehicleTrunkWeapons=Shotgun_Baretta;
AllTextMode=False
AmbientScenariosMaximum=2
AmbientScenariosMultiplier=250
DepartmentName=Liberty City Police Department
DepartmentShortName=LCPD
FirstStart=True
UsingPoliceStationMod=False
PreloadAllModels=True

 

Working fine at the moment, thx.

I'll write when there are problems again.

Thank you. :)

Glad to hear that, and glad that I could help :)