Plutonium

You are most likely missing a Visual C++ Redistributable. Install the VC_redist.x64 that comes with the game. Or just get it from Microsoft.
Fortunately I cant post links since I have 0 rep.

A Call of Duty: Black Ops 1 Zombies GSC script for Plutonium that lets players "pause the game" without disrupting gameplay for others.
Intended for server use. (but should work in private)
Inspired and built of: https://forum.plutonium.pw/topic/23194/release-basic-coop-pause-for-zombie-mode

Download from: https://github.com/Skoivumaki/T5-ZM-AFK-Script
Install by moving afkScript.gsc to %localappdata%\Plutonium\storage\t5\scripts\sp\zom

If you like the release give the repository a star!

Features:

AFK Mode

• Toggle AFK mode with [Aim Down Sights] + [Melee].
• 60-second cooldown between activations (configurable).
• Auto-disables after 2 minutes (configurable).
• Teleports player to a safe AFK position with a nice view
• God mode enabled and controls frozen to prevent shooting.
• Optional on-screen HUD information while AFK.
• Notify all players when someone enters/leaves AFK.

AFK Return & Grace Period

• Teleports player back to map spawn.
• 10-second grace period with God mode enabled (configurable).
• Visual countdown before grace period ends.

Map Support

• Predefined AFK positions for:
  • Kino der Toten
  • Five
  • Default fallback for unsupported maps. (May or may not work)

Want to Contribute? (I don't own all maps)

See GitHub Repo for information how to!

Preview in kino: