This appears to be an issue with one of your callout plugins. Based on the logs, MCCallouts was running at the time of the crash. Note that "CalloutManager" is not referencing a plugin/mod but rather part of LSPDFR's core engine, indicating that LSPDFR had an issue while handling a task related to a callout plugin.
Specifically, the crash occurred immediately after MCCallouts spawned the peds and vehicles:
Additionally, based on the logs and given that you're using the latest version of MCCallouts, I suggest confirming that all of the vehicle and ped models configured for MCCallouts are working correctly. For MCCallouts, these settings are are configured within the plugins/lspdfr/MCCallouts.ini file.
If that doesn't work, I recommend temporarily removing all of your callout scripts by moving them out of your games plugins/ directory. If you're able to play with no issues for some time, we can confirm there is an issue with one or more callouts. From there, add your callout plugins back one by one to determine which plugin is causing the crash.
I hope this helps!