在centos6.5下安装hostmaster最后一步出现这种错误怎么解决

详细报错信息如下：
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escapeshellarg() expects parameter 1 to be string, array given [warning]
drush.inc:1387
escapeshellarg() expects parameter 1 to be string, array given [warning]
drush.inc:1387
strtr(): The second argument is not an array drush.inc:643 [warning]
strtr(): The second argument is not an array drush.inc:643 [warning]
The drush command '@none provision-save' could not be found. [error]
A Drupal installation directory could not be found [error]
escapeshellarg() expects parameter 1 to be string, array given [warning]
drush.inc:1387
escapeshellarg() expects parameter 1 to be string, array given [warning]
drush.inc:1387
escapeshellarg() expects parameter 1 to be string, array given [warning]
drush.inc:1387
strtr(): The second argument is not an array drush.inc:643 [warning]
strtr(): The second argument is not an array drush.inc:643 [warning]
The drush command '@server_master provision-verify' could not be [error]
found.
A Drupal installation directory could not be found