Greetings. I'm new at this -- I have PHP experience, but have never done anything with Ruby before.  I'm running Amazon Linux on AWS EC2 and have installed OpenProject.  I've configured it to reuse a database I set up on a separate AWS RDS mySQL server.  I believe it is connecting to the server correctly, because one of the time I retried I typed the password wrong and it told me there was a connection error... so if I don't get the error other times I'm assuming it is connecting.  But after I run the openproject configure tool I get the following: 

[openproject] ./bin/configure 
[legacy-installer] ./bin/preinstall 
[mysql] ./bin/preinstall 
[apache2] ./bin/preinstall 
[repositories] ./bin/preinstall 
[smtp] ./bin/preinstall 
[memcached] ./bin/preinstall 
No memcached server to install. Skipping. 
[openproject] ./bin/preinstall 
[legacy-installer] ./bin/postinstall 
[mysql] ./bin/postinstall 
Generating /etc/openproject/conf.d/database... 
[apache2] ./bin/postinstall 
[repositories] ./bin/postinstall 
No repositories have been configured. Skipping configuration. 
[smtp] ./bin/postinstall 
[memcached] ./bin/postinstall 
[openproject] ./bin/postinstall 
/opt/openproject/vendor/bundle/ruby/2.5.0/bin/rake db:migrate db:seed packager:postinstall: relocation error: /opt/openproject/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.1/lib/mysql2/mysql2.so: symbol mysql_server_init, version libmysqlclient_18 not defined in file libmysqlclient.so.18 with link time reference

The error looks like it has something to do with Ruby/mySQL but I don't really understand this. 

Also, after this runs, I've tried to do sudo openproject run console and I get a very similar error: 

ruby: relocation error: /opt/openproject/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.1/lib/mysql2/mysql2.so: symbol mysql_server_init, version libmysqlclient_18 not defined in file libmysqlclient.so.18 with link time reference 
You have new mail in /var/spool/mail/ec2-user 

Please help. 

Thanks!