This error happens when the critical Dynamic Link Library (DLL) component that bridges your game and the Steam platform goes missing, gets corrupted, or gets blocked by security software. Below is a complete, verified step-by-step guide to resolving the issue and getting your game running smoothly.
Add the Black Ops III folder to your antivirus . Manually Reinstall the Steam Client This error happens when the critical Dynamic Link
“Error: steamapi64.dll not found.”