You might have outdated .asi mods that are incompatible with the 1.0.350.1 game logic. The Fix: Temporarily move all other .asi files (except ScriptHookV.dll and NativeTrainer.asi ) to a backup folder on your desktop. Add them back one by one to find the culprit.
Press F4 (default). If nothing happens, check that NativeTrainer.asi is present. Try pressing F3 or F5 (some older versions use different keys). script hook v version 1.0.350.1 download