I am getting this same error too. Removing LSPDFR+ until it's fixed as this is a pretty important feature for it to coincide with.
Installing ELS without Modding Pack V is super easy. We can even Discord screen share if you want, and I can watch over your installation to verify accuracy.
If you end up reverting to non-ELS cars, let me recommend the LSPD and sheriff/FBI replacement packs by Captain14. They are automatic installers via OpenIV and I have confirmed they work with LSPDFR 0.4. They are even ELS-style, so they'll look real! Be advised though; some people report needing a modified gameconfig (easy to find) while others don't (I didn't), and one of the packs doesn't uninstall automatically, so be aware of the install location (it's a separate patchday folder).