Cannot activate Twitter integration

[mattes3]

Describe the bug

I have installed a self-hosted version of Erxes, from the DigitalOcean marketplace. The droplet is running fine, and I have a messenger intergration running.

Now, I wanted to integrate Twitter. I got a developer account, generated the keys, put them into the system settings in Erxes.

Now, in "Settings / App Store / Social Media", I find Twitter but it is marked as "coming soon". However, here in the source code, I can find a Twitter integration.

I don't understand.

To Reproduce

Steps to reproduce the behavior:

1. Follow the rules in https://www.erxes.org/administrator/system-config/#twitter
2. Go to 'Settings / App Store / Social Media'
3. See the "Coming Soon" badges. It is not possible to install a Twitter integration.

Expected behavior

I expected Twitter to be installable in Erxes.

Screenshots

I will add a screenshot.

Context (please include the related information if applicable):

• OS: Ubuntu 18.04.5 LTS (GNU/Linux 4.15.0-112-generic x86_64)
• Browser version: Firefox 79.0 (64-Bit)
• erxes version: 0.16
• installation type: DigitalOcean marketplace

[mattes3]