PHP Warning: session_start() [<a href='function.session-start'>function.session-start</a>]: open(/var/php_sessions/sess_5162961a7474b531be725e2d1670445f, O_RDWR) failed: No such file or directory (2) in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/Session.php on line 169
PHP Warning: session_start() [<a href='function.session-start'>function.session-start</a>]: open(/var/php_sessions/sess_a67211f8e1fb324fa7e7f9359ea0abe2, O_RDWR) failed: No such file or directory (2) in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/Session.php on line 169
I'm not sure about this but it looks like baseURL points to the wrong location so the session cannot start. I don't have a solution for this one. I'll let you know when I know. What version of Silverstripe you're using? did you check it out from the trunk?
PHP Warning: Warning: there are two 'ArchiveWidget' files both containing the same class: '/home/users/web/b778/moo.pedstaff/_devsite/mysite/code/ArchiveWidget.php' and '/home/users/web/b778/moo.pedstaff/_devsite/mysite/blog/code/ArchiveWidget.php'.
This might mean that the wrong code is being used. in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/ManifestBuilder.php on line 253
PHP Warning: Warning: there are two 'BlogEntry' files both containing the same class: '/home/users/web/b778/moo.pedstaff/_devsite/mysite/code/BlogEntry.php' and '/home/users/web/b778/moo.pedstaff/_devsite/mysite/blog/code/BlogEntry.php'.
This might mean that the wrong code is being used. in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/ManifestBuilder.php on line 253
PHP Warning: Warning: there are two 'BlogHolder' files both containing the same class: '/home/users/web/b778/moo.pedstaff/_devsite/mysite/code/BlogHolder.php' and '/home/users/web/b778/moo.pedstaff/_devsite/mysite/blog/code/BlogHolder.php'.
This might mean that the wrong code is being used. in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/ManifestBuilder.php on line 253
PHP Warning: Warning: there are two 'BlogManagementWidget' files both containing the same class: '/home/users/web/b778/moo.pedstaff/_devsite/mysite/code/BlogManagementWidget.php' and '/home/users/web/b778/moo.pedstaff/_devsite/mysite/blog/code/BlogManagementWidget.php'.
This might mean that the wrong code is being used. in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/ManifestBuilder.php on line 253
PHP Warning: Warning: there are two 'RSSWidget' files both containing the same class: '/home/users/web/b778/moo.pedstaff/_devsite/mysite/code/RSSWidget.php' and '/home/users/web/b778/moo.pedstaff/_devsite/mysite/blog/code/RSSWidget.php'.
This might mean that the wrong code is being used. in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/ManifestBuilder.php on line 253
PHP Warning: Warning: there are two 'TagCloudWidget' files both containing the same class: '/home/users/web/b778/moo.pedstaff/_devsite/mysite/code/TagCloudWidget.php' and '/home/users/web/b778/moo.pedstaff/_devsite/mysite/blog/code/TagCloudWidget.php'.
This might mean that the wrong code is being used. in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/ManifestBuilder.php on line 253
PHP Warning: Warning: there are two 'TypoImport' files both containing the same class: '/home/users/web/b778/moo.pedstaff/_devsite/mysite/code/import/TypoImport.php' and '/home/users/web/b778/moo.pedstaff/_devsite/mysite/blog/code/import/TypoImport.php'.
This might mean that the wrong code is being used. in /hermes/web08/b778/moo.pedstaff/_devsite/sapphire/core/ManifestBuilder.php on line 253
Just remove one of the duplication (from here _devsite/mysite/code/...)
Well, hope someone can help you with the session issue.