So very strangely, I've found that three map mods in dlclist.xml were causing LSPDFR to crash when trying to load into singleplayer. The exception is below:

[7/8/2024 2:32:59 PM.278] LSPD First Response: [TRACE] Started loading LSPDFR
[7/8/2024 2:32:59 PM.278] LSPD First Response: [INFO] Running LSPD First Response 0.4.9 (0.4.8943.27879)
[7/8/2024 2:32:59 PM.278] LSPD First Response: [INFO] Compiled on 26 Jun 2024 19:29:18 UTC
[7/8/2024 2:32:59 PM.278] LSPD First Response: [INFO] Copyright © 2015-2020, G17 Media, www.lspdfr.com
[7/8/2024 2:33:01 PM.730] LSPD First Response: 
[7/8/2024 2:33:01 PM.730] LSPD First Response: ==============================
[7/8/2024 2:33:01 PM.730] LSPD First Response: UNHANDLED EXCEPTION DURING GAME FIBER TICK
[7/8/2024 2:33:01 PM.730] LSPD First Response: ------------------------------
[7/8/2024 2:33:01 PM.730] LSPD First Response: Origin: Game fiber "Plugin "LSPD First Response" main fiber".
[7/8/2024 2:33:01 PM.730] LSPD First Response: ------------------------------
[7/8/2024 2:33:01 PM.730] LSPD First Response: Exception type: System.AccessViolationException
[7/8/2024 2:33:01 PM.730] LSPD First Response: Exception message: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
[7/8/2024 2:33:01 PM.730] LSPD First Response: ------------------------------
[7/8/2024 2:33:01 PM.730] LSPD First Response: Inner exceptions:
[7/8/2024 2:33:01 PM.730] LSPD First Response: ------------------------------
[7/8/2024 2:33:01 PM.730] LSPD First Response: Stack trace:
[7/8/2024 2:33:01 PM.730] LSPD First Response: at Rage.Native.NativeFunction.CallByAddress(IntPtr address, Type returnType, NativeArgument[] arguments)
[7/8/2024 2:33:01 PM.730] at Rage.Native.NativeFunction.CallByHash(UInt64 nativeHash, Type returnType, NativeArgument[] arguments)
[7/8/2024 2:33:01 PM.730] at Rage.Native.NativeFunction.CallByHash[ReturnType](UInt64 nativeHash, NativeArgument[] arguments)
[7/8/2024 2:33:01 PM.730] at WmNPETcPKRMNlmjqVPKgDsXaHBRM.YgEZVRHfggoQicICJUFYHAAjNVjK() in D:\GTA V\LSPD First Response\LSPD First Response\Mod\LSPDFR.cs:line 464
[7/8/2024 2:33:01 PM.730] at WmNPETcPKRMNlmjqVPKgDsXaHBRM.mciTtfMWbMVbgYEmfidSWMdEvTHI() in D:\GTA V\LSPD First Response\LSPD First Response\Mod\LSPDFR.cs:line 161
[7/8/2024 2:33:01 PM.730] at Rage.GameFiber.Main()
[7/8/2024 2:33:01 PM.730] LSPD First Response: ==============================
[7/8/2024 2:33:01 PM.730] LSPD First Response: 
[7/8/2024 2:33:01 PM.732] LSPD First Response: [TRACE] Thread CopManager #1 initialized
[7/8/2024 2:33:01 PM.735] LSPD First Response: [FATAL] Forced termination
[7/8/2024 2:33:01 PM.738] LSPD First Response: [TRACE] Released 0 entities from DefaultContentManager
[7/8/2024 2:33:01 PM.755] LSPD First Response: [INFO] LSPDFR has shut down

After a LOT of troubleshooting, I determined it to be an issue with map mods located in my dlclist.xml within update.rpf:
 

<Item>dlcpacks:/custom_maps/</Item>
<Item>dlcpacks:/forest_n/</Item>
<Item>dlcpacks:/forest_s/</Item>
<Item>dlcpacks:/vremastered/</Item>

Forests of San Andreas: Revised [Add-On | YMAP | YMT | CARGEN | LODs | OIV | SP | FiveM] - GTA5-Mods.com

New Realistic Forests of Blaine County + Abandoned Cabins [YMAP] - GTA5-Mods.com

GTA V Remastered: Enhanced [Add-On | YMAP | LODs | OIV | SP | FiveM] - GTA5-Mods.com

 

For the time being I've removed these from my dlclist.xml file but is there any other solution by chance?

Edited July 8, 20241 yr by CosmicDev
minor correction

The error only shows when LSPDFR cannot load assets, namely, the MP map assets. One of your mods is breaking that and is therefore incompatible with LSPDFR.

1 hour ago, Cyan said:

The error only shows when LSPDFR cannot load assets, namely, the MP map assets. One of your mods is breaking that and is therefore incompatible with LSPDFR.

That is BEYOND strange, because by installing the mod "RDE" the issue was fixed and I was able to use LSPDFR with those map mods. Really wierd.