I get this error when I go the the folder view page (refresh removes the error and folder view is fine)

warning: file_get_contents(/tmp/devel_themer_6635978644b82d2a4ab247) [function.file-get-contents]: failed to open stream: No such file or directory in /home/canineco/public_html/mail/sites/all/modules/devel/devel_themer.module on line 52.  

Error when I click on "show full header"

warning: imap_fetchheader() [function.imap-fetchheader]: Bad message number in /home/canineco/public_html/mail/sites/all/modules/mail_api/contrib/imapwu_api/imapwu_api.module on line 139.
warning: imap_body() [function.imap-body]: Bad message number in /home/canineco/public_html/mail/sites/all/modules/mail_api/contrib/imapwu_api/imapwu_api.module on line 198.


Source for "folders block"

<h2>Folders</h2> 
 
  <div class="content"><span id="thmr_59" class="thmr_call"> 
  <form action="/mail/webmail_plus/view_folder/INBOX"  accept-charset="UTF-8" method="post" id="webmail-plus-user-folders"> 
<div><ul><span id="thmr_53" class="thmr_call"> 
  <div class="form-item"> 
 <li><span class='webmail_plus_read_folder'><span id="thmr_49" class="thmr_call"> 
  <a href="/mail/webmail_plus/view_folder/.Drafts">.Drafts</a></span> 
 
</span></li><li><span class='webmail_plus_read_folder'><span id="thmr_50" class="thmr_call"> 
  <a href="/mail/webmail_plus/view_folder/.Junk">.Junk</a></span> 
 
</span></li><li><span class='webmail_plus_read_folder'><span id="thmr_51" class="thmr_call"> 
  <a href="/mail/webmail_plus/view_folder/.Sent">.Sent</a></span> 
 
</span></li><li><span class='webmail_plus_read_folder'><span id="thmr_52" class="thmr_call"> 
  <a href="/mail/webmail_plus/view_folder/.Trash">.Trash</a></span>