Is there any message in log file (which locates in %MYCOLLAB_HOME%/logs helpful? Also could you inspect the browser console and is there any error message helps me understand what is going on?

I guess the admin should do that. Otherwise, the self-signup must separate the workspace you with the existing workspace because of the security purpose. 

Tip: while waiting for the mass invitation from the next release, you can create a project, then invite all people by emails. In the specific project, we allow inviting many people by emails.

Are you running MyCollab on your own? You don't need to self-signup. After you install MyCollab, then you created the admin account and run it.

Perfect! Hope you enjoy MyCollab! If you have any issue, please let me know.

by the way, the error caused by the last  database script. You almost done in installation ! When you download MyCollab files?

It seems the above message is the one you run MyCollab script again.

Go to log folder at %mycollab_home%/logs and give me the first error message. Thanks 
 

could you give me the error log in the console ? Or the recorded messages in log file in the folder %Mycollab_home%/logs

It is ok! OR you can use the command like this

export MYCOLLAB_OPTS="-noverify -server -Xms394m -Xmx768m -XX:NewSize=128m -XX:+DisableExplicitGC -XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC"

We will update the bash script. Thanks for the report!

You go to %MYCOLLAB_HOME%/bin, and edit mycollab.sh, removed the variable -server in the line '

export MYCOLLAB_OPTS=-noverify -server -Xms394m -Xmx768m -XX:NewSize=128m -XX:+DisableExplicitGC -XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC'

then try to run again. Let me know if it is fixed.

Check the MyCollab 7.0.1