This could be an issue with you having the map installed, while the server has the map without the custom items on it. Try to fix that.

It is still saying the same thing, I need to put it in "E:\Steam\steamapps\common\Unturned\Servers\The Driftless MK\Workshop\Content" right?

EDIT: System Infomation

Computer Information:
Manufacturer: MSI
Model: MS-7680
Form Factor: Desktop
No Touch Input Detected

Processor Information:
CPU Vendor: GenuineIntel
CPU Brand: Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz
CPU Family: 0x6
CPU Model: 0x2a
CPU Stepping: 0x7
CPU Type: 0x0
Speed: 3093 Mhz
4 logical processors
2 physical processors
HyperThreading: Supported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported
AES: Unsupported
AVX: Supported
CMPXCHG16B: Supported
LAHF/SAHF: Supported
PrefetchW: Supported

Network Information:
Network Speed:

Operating System Version:
Windows 7 (64 bit)
NTFS: Supported
Crypto Provider Codes: Supported 311 0x0 0x0 0x0

Video Card:
Driver: AMD Radeon HD 7700 Series

DirectX Driver Name: aticfx32.dll
Driver Version: 16.300.2511.1001
DirectX Driver Version: 8.17.10.1474
Driver Date: 11 Aug 2016
OpenGL Version: 4.5
Desktop Color Depth: 32 bits per pixel
Monitor Refresh Rate: 59 Hz
DirectX Card: AMD Radeon HD 7700 Series
VendorID: 0x1002
DeviceID: 0x683d
Revision Not Detected
Number of Monitors: 1
Number of Logical Video Cards: 1
No SLI or Crossfire Detected
Primary Display Resolution: 1920 x 1080
Desktop Resolution: 1920 x 1080
Primary Display Size: 26.65" x 15.00" (30.55" diag)
67.7cm x 38.1cm (77.6cm diag)
Primary Bus Type Not Detected
Primary VRAM: 1024 MB
Supported MSAA Modes: 2x 4x 8x

Sound card:
Audio device: Speakers (USB Audio Device)

Memory:
RAM: 8157 Mb

Miscellaneous:
UI Language: English
Microphone: Not set
Steam Controller Cable and Base: Not set
Media Type: DVD
Total Hard Disk Space Available: 1106389 Mb
Largest Free Hard Disk Block: 612438 Mb
OS Install Date: Dec 31 1969
Game Controller: None detected
VR Headset: None detected
[/spoiler

fffffuuu

Try redownloading the map into you'r server.

I tried redownloading it and it didn't work.

Did you download the Addons? Thats what it looks like. I just moved the from the workshop into my map folder, and into the Server "levels" folder. I didnt have to move anything else to get it to work.

How did you move the map into your levels folder from the workshop? My server can't find this map even though I've downloaded and redownloaded it multiple times.