Redmine

Hello,
Is there anyone who might be familiar with such installation errors? This never happened on another hosting servers, when installed Redmine software:
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[!] There was an error parsing `Gemfile`: (<unknown>): mapping values are not allowed in this context at line 9 column 36. Bundler cannot continue.

1. from /var/www/vhosts/bernackis.com/redmine.bernackis.com/public/Gemfile:63
2. -------------------------------------------
3. if File.exist?(database_file)

database_config = YAML::load(ERB.new(IO.read(database_file)).result)

1. adapters = database_config.values.map {|c| c['adapter']}.compact.uniq
2. -------------------------------------------
   ERROR:rubymng:Command '['/usr/local/psa/admin/sbin/filemng', 'bernacki', 'exec', '/var/www/vhosts/bernackis.com/redmine.bernackis.com/public', '/bin/bash', '-l', '-c', 'bundle install --path vendor/bundle']' returned non-zero exit status 4

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If someone knows how to handle these issues, kindly let me know,
Thanks in advance!