So basically when i start GTA IV , after loading the game , a message pops up saying that LCPDFR encountered an error . So here's what i found in the .log file . Please notice that i'm from Italy and some lines of the file may be in italian .

[INFO - 5:50:22 PM] [Log] Started
[INFO - 5:50:22 PM] [Main] Main: Initializing...
[INFO - 5:50:22 PM] [Main] Main: LCPDFR Engine (C) 2011-2013 LMS
[INFO - 5:50:22 PM] [Main] Main: DO NOT USE THIS WITHOUT PERMISSION. YOU MAY NOT SHARE, MODIFY OR DECOMPILE THIS FILE.
[INFO - 5:50:22 PM] [PluginManager] Initialize: Loading custom plugins
[WARNING - 5:50:22 PM] [Settings] ReadSettings: Invalid entry 
[INFO - 5:50:22 PM] [Settings] ReadSettings: Suspect transporter POLICE
[INFO - 5:50:22 PM] [Settings] ReadSettings: Suspect transporter POLICE2
[INFO - 5:50:22 PM] [Settings] ReadSettings: Suspect transporter PSTOCKADE
[WARNING - 5:50:22 PM] [Settings] ReadSettings: Invalid entry 
[INFO - 5:50:22 PM] [Plugin.Main] Changing language to en-US
[INFO - 5:50:22 PM] [Main] Main: Initializing done
[ERROR - 17.50.22] [PluginManager] Unhandled exception caught while processing plugin: Main. Plugin will no longer be executed.
[ERROR - 17.50.22] [Plugin.Main] System.MissingMethodException: Impossibile trovare il metodo Boolean AdvancedHookManaged.AGame.GetIsTextInputActive().
   in .()
   in .get_TextInputActive() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineGUIGui.cs:riga 77
   in .(ELCPDFRKeys  Boolean ) in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseLCPDFRInputKeyHandler.cs:riga 169
   in LCPD_First_Response.LCPDFR.Main.ProcessStart() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseLCPDFRMain.cs:riga 462
   in LCPD_First_Response.LCPDFR.Main.Process() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseLCPDFRMain.cs:riga 246
   in .() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingPluginsPluginManager.cs:riga 158
[ERROR - 17.50.22] [ExceptionHandler]  ‎‍‬‍‪‭‮‪‪‮‍‬​‫‬‬‍‍‭‏‎‪‪‍‫‏‮‏‮.‬‍‎‬‌​‬‪‮‫‎‪‮‭‬‌‬‏‌‮‫‏‮() L_ffffffff 
 ‎‍‬‍‪‭‮‪‪‮‍‬​‫‬‬‍‍‭‏‎‪‪‍‫‏‮‏‮.get_TextInputActive() L_0000 
 ‏‫‎‎‎‍‫‍‭‏‭‮‮‮​‪​‌‫‍‏‌‌‌‮.‬‭‫‏‏‌‪‍‫‪​‮‮‭‪​‮‏​‪‎‮‍‍‮‍‏‮(ELCPDFRKeys , Boolean ) L_0033 
 LCPD_First_Response.LCPDFR.Main.ProcessStart() L_0000 
 LCPD_First_Response.LCPDFR.Main.Process() L_02e0 
 ​‏‍‬‍‎‪‮‮‫​‍​‏‌‌‎‌‬‪‮‎‪‫‎‫‎‮.‭‎‬‏‪‬‎‪‏‬​‌‏‮‫‍​‎‮‏‎‪‮‮() L_0020 
Error hash: D6966DE59E670E866846E2118A544D0678A15DCA
[INFO - 17.50.22] [ServerCommunication] InitializeConnection: Internet connection available
[INFO - 17.50.23] [ServerCommunication] InitializeConnection: Public IP Address is: 95.239.76.147
[INFO - 17.50.26] [ServerCommunication] InitializeConnection: Found configuration for the masterserver, going to use API server v2.lcpdfr.onlineservices.g17media.com
[INFO - 17.50.26] [ServerCommunication] InitializeConnection: Establishing session with the LCPDFR server...
[INFO - 17.50.26] [ServerCommunication] GetSession: Got session ID of 3a7e3dcc-d913-a0e6-00c3-445edd8601c5 from masterserver.
[INFO - 17.50.26] [NetworkManager] NetworkManager: In network session: False Is host: False
[INFO - 17.50.26] [Authentication] Authentication: Server available, using online authentication
[ERROR - 17.50.27] [ServerCommunication] GetUserInformationString: Failed to query data
[WARNING - 17.50.27] [Stats] CollectSystemInformation: Failed to upload stats: Errore del server remoto: (404) Non trovato.
[ERROR - 17.50.28] [Authentication] Authentication: Error 0x320
[ERROR - 17.50.28] [Authentication] Authentication: Authentication failed
[INFO - 17.50.28] [Authentication] Authentication: Failed to authenticate
[ERROR - 17.50.49] [Main] CRITICAL ERROR DURING MAINLOOP! REPORT THIS ISSUE AT LCPDFR.COM BY INCLUDING THIS LOGFILE.
[ERROR - 17.50.49] [] System.MissingMethodException: Impossibile trovare il metodo Boolean AdvancedHookManaged.AVehicle.get_HasSiren().
   in .(AVehicle )
   in ..ctor( vehicle) in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesSirenManager.cs:riga 124
   in .() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesCVehicle.cs:riga 279
   in ..ctor(Int32 handle) in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesCVehicle.cs:riga 245
   in .() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesPoolUpdaterUnmanaged.cs:riga 96
   in LCPD_First_Response.Engine.Main.() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineMain.cs:riga 303
[ERROR - 17.50.49] [ExceptionHandler]  ‫‪‍‫‬‎​‭‍​‭‎‏‬‬‪‫‬‌‏‍‪‏‌‏‏‪‮‭​‮.​‭‭‪‍‮‌‪‪‮‍‫‮‌‏‪‍‏‏‭‪‪‬‎‮(AVehicle ) L_ffffffff 
 ‫‪‍‫‬‎​‭‍​‭‎‏‬‬‪‫‬‌‏‍‪‏‌‏‏‪‮‭​‮..ctor(‌‏​‫‏‪​‍‏‎‪‮‬​‭‭‬‭‭‎‬‎‭‬‭‮ vehicle) L_0063 
 ‌‏​‫‏‪​‍‏‎‪‮‬​‭‭‬‭‭‎‬‎‭‬‭‮.‬‬​‍‎‪‬‫‏‭‫‪‭‪‌‪‭‪‎‫‭‪‌‮() L_009e 
 ‌‏​‫‏‪​‍‏‎‪‮‬​‭‭‬‭‭‎‬‎‭‬‭‮..ctor(Int32 handle) L_002c 
 ‭‬​‏‏‌‭‭‭‎​‪‌‬‎‭‮‮‭‌‏‌‫​‌‮‪​‮.‪‪‮‌‭‏‏‏‍‌‍​‬‏‬‌​‎‎‮() L_0375 
 LCPD_First_Response.Engine.Main.‭‎‬‏‪‬‎‪‏‬​‌‏‮‫‍​‎‮‏‎‪‮‮() L_0160 
Error hash: DA7952546AACF77DBF9233DA15CC4E1C2BB79D84
[ERROR - 17.50.52] [Main] CRITICAL ERROR DURING MAINLOOP! REPORT THIS ISSUE AT LCPDFR.COM BY INCLUDING THIS LOGFILE.
[ERROR - 17.50.52] [] System.MissingMethodException: Impossibile trovare il metodo Boolean AdvancedHookManaged.AVehicle.get_HasSiren().
   in .(AVehicle )
   in ..ctor( vehicle) in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesSirenManager.cs:riga 124
   in .() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesCVehicle.cs:riga 279
   in ..ctor(Int32 handle) in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesCVehicle.cs:riga 245
   in .() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingEntitiesPoolUpdaterUnmanaged.cs:riga 96
   in LCPD_First_Response.Engine.Main.() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineMain.cs:riga 303
[ERROR - 17.50.52] [ExceptionHandler]  ‫‪‍‫‬‎​‭‍​‭‎‏‬‬‪‫‬‌‏‍‪‏‌‏‏‪‮‭​‮.​‭‭‪‍‮‌‪‪‮‍‫‮‌‏‪‍‏‏‭‪‪‬‎‮(AVehicle ) L_ffffffff 
 ‫‪‍‫‬‎​‭‍​‭‎‏‬‬‪‫‬‌‏‍‪‏‌‏‏‪‮‭​‮..ctor(‌‏​‫‏‪​‍‏‎‪‮‬​‭‭‬‭‭‎‬‎‭‬‭‮ vehicle) L_0063 
 ‌‏​‫‏‪​‍‏‎‪‮‬​‭‭‬‭‭‎‬‎‭‬‭‮.‬‬​‍‎‪‬‫‏‭‫‪‭‪‌‪‭‪‎‫‭‪‌‮() L_009e 
 ‌‏​‫‏‪​‍‏‎‪‮‬​‭‭‬‭‭‎‬‎‭‬‭‮..ctor(Int32 handle) L_002c 
 ‭‬​‏‏‌‭‭‭‎​‪‌‬‎‭‮‮‭‌‏‌‫​‌‮‪​‮.‪‪‮‌‭‏‏‏‍‌‍​‬‏‬‌​‎‎‮() L_0375 
 LCPD_First_Response.Engine.Main.‭‎‬‏‪‬‎‪‏‬​‌‏‮‫‍​‎‮‏‎‪‮‮() L_0160 
Error hash: DA7952546AACF77DBF9233DA15CC4E1C2BB79D84
------------------------
[INFO - 5:52:19 PM] [Log] Started
[INFO - 5:52:19 PM] [Main] Main: Initializing...
[INFO - 5:52:19 PM] [Main] Main: LCPDFR Engine (C) 2011-2013 LMS
[INFO - 5:52:19 PM] [Main] Main: DO NOT USE THIS WITHOUT PERMISSION. YOU MAY NOT SHARE, MODIFY OR DECOMPILE THIS FILE.
[INFO - 5:52:20 PM] [PluginManager] Initialize: Loading custom plugins
[WARNING - 5:52:20 PM] [Settings] ReadSettings: Invalid entry 
[INFO - 5:52:20 PM] [Settings] ReadSettings: Suspect transporter POLICE
[INFO - 5:52:20 PM] [Settings] ReadSettings: Suspect transporter POLICE2
[INFO - 5:52:20 PM] [Settings] ReadSettings: Suspect transporter PSTOCKADE
[WARNING - 5:52:20 PM] [Settings] ReadSettings: Invalid entry 
[INFO - 5:52:20 PM] [Plugin.Main] Changing language to en-US
[INFO - 5:52:20 PM] [Main] Main: Initializing done
[ERROR - 17.52.20] [PluginManager] Unhandled exception caught while processing plugin: Main. Plugin will no longer be executed.
[ERROR - 17.52.20] [Plugin.Main] System.MissingMethodException: Impossibile trovare il metodo Boolean AdvancedHookManaged.AGame.GetIsTextInputActive().
   in .()
   in .get_TextInputActive() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineGUIGui.cs:riga 77
   in .(ELCPDFRKeys  Boolean ) in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseLCPDFRInputKeyHandler.cs:riga 169
   in LCPD_First_Response.LCPDFR.Main.ProcessStart() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseLCPDFRMain.cs:riga 462
   in LCPD_First_Response.LCPDFR.Main.Process() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseLCPDFRMain.cs:riga 246
   in .() in d:GTA IVLCPDFRSVNtrunkLCPD First ResponseEngineScriptingPluginsPluginManager.cs:riga 158
[ERROR - 17.52.20] [ExceptionHandler]  ‎‍‬‍‪‭‮‪‪‮‍‬​‫‬‬‍‍‭‏‎‪‪‍‫‏‮‏‮.‬‍‎‬‌​‬‪‮‫‎‪‮‭‬‌‬‏‌‮‫‏‮() L_ffffffff 
 ‎‍‬‍‪‭‮‪‪‮‍‬​‫‬‬‍‍‭‏‎‪‪‍‫‏‮‏‮.get_TextInputActive() L_0000 
 ‏‫‎‎‎‍‫‍‭‏‭‮‮‮​‪​‌‫‍‏‌‌‌‮.‬‭‫‏‏‌‪‍‫‪​‮‮‭‪​‮‏​‪‎‮‍‍‮‍‏‮(ELCPDFRKeys , Boolean ) L_0033 
 LCPD_First_Response.LCPDFR.Main.ProcessStart() L_0000 
 LCPD_First_Response.LCPDFR.Main.Process() L_02e0 
 ​‏‍‬‍‎‪‮‮‫​‍​‏‌‌‎‌‬‪‮‎‪‫‎‫‎‮.‭‎‬‏‪‬‎‪‏‬​‌‏‮‫‍​‎‮‏‎‪‮‮() L_0020 
Error hash: D6966DE59E670E866846E2118A544D0678A15DCA
[INFO - 17.52.20] [ServerCommunication] InitializeConnection: Internet connection available
[INFO - 17.52.20] [ServerCommunication] InitializeConnection: Public IP Address is: 95.239.76.147
[INFO - 17.52.23] [ServerCommunication] InitializeConnection: Found configuration for the masterserver, going to use API server v2.lcpdfr.onlineservices.g17media.com
[INFO - 17.52.23] [ServerCommunication] InitializeConnection: Establishing session with the LCPDFR server...
[INFO - 17.52.23] [ServerCommunication] GetSession: Got session ID of ca9f05d6-cec1-319a-3e16-ae2c353c2a2b from masterserver.
[INFO - 17.52.23] [NetworkManager] NetworkManager: In network session: False Is host: False
[INFO - 17.52.23] [Authentication] Authentication: Server available, using online authentication
[ERROR - 17.52.23] [ServerCommunication] GetUserInformationString: Failed to query data
[ERROR - 17.52.24] [Authentication] Authentication: Error 0x320
[ERROR - 17.52.24] [Authentication] Authentication: Authentication failed
[INFO - 17.52.24] [Authentication] Authentication: Failed to authenticate
[WARNING - 17.52.25] [Stats] CollectSystemInformation: Failed to upload stats: Errore del server remoto: (404) Non trovat

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