[Bug|Feature Request] Screenshot Issue

**Feature Request or Bug**
Bug

**Describe the feature request or bug**
For a long time I have trouble getting screenshots from compromised systems (grunts). When I issue command: `Screenshot` I always get empty picture

First time I tried this was few months ago and I had same problem, and I tried Covenant now in the hope that it would work now but it doesn't. Because of this one issue I used to avoid using Covenant in past.

**Expected behavior**
I expected one simple screenshot :)

**Screenshots**
grunt info


When I try to go to /data directory I get this from web browser


**Covenant Server Information:**
- OS: Ubuntu 18.04.6 LTS (bionic) 64 bit. I'm running this on Amazon AWS EC2 with 8 GB ram

**Browser Information:**
- Browser: Chrome 95.0.4638.69

**Target Information (System that implant is running on):**
- OS: Windows Server 2019 Datacenter 64 bit running on amazon AWS EC2
- Build: 17763

**Additional context**
Errors from terminal:


I installed everything as documentation said. Got SDK 3.1 and downloaded covenant from github with `git clone --recurse-submodules https://github.com/cobbr/Covenant` command. Tried many variations, also installed to my local VM but result is same :)

I searched same error and it seems someone had this issue in past and it was supposed to be fixed by now but it isn't.

EDIT: I looked at source code and it seems master branch doesn't have fix for this :) :) :) only dev branch which seems doesn't work on SDK 3.1