title: opencart Internal Server Error 500
body: <p>I use shoppica theme for opencart. When I log in as a test customer and click on order history section I always get a internal server error 500. I haven't changed anything in .htaccess nor in config file. It was from the begging but from now on I need it. All the sections in customer panel works except order history and transaction section. One clue is, when I give a reward transaction to my customer the transaction section which was before in the panel would disappeared and gave me an internal 500 error. Please help me as I need it a lot.
  I can't install it again because it is for 3 months and I can't start from the beginning.
  I use opencart 1.5.3.1 </p>
  
  <p>for another internal error I got these errors in my log:</p>
  
  <pre><code>PHP Warning:  unlink(public_html/system/cache/cache.currency.1358109327) [&lt;a href='function.unlink'&gt;function.unlink&lt;/a&gt;]: No such file or directory in public_html/system/library/cache.php on line 14
  PHP Warning:  session_start() [&lt;a href='function.session-start'&gt;function.session-start&lt;/a&gt;]: Cannot send session cookie - headers already sent by (output started at public_html/index.php:104) in public_html/system/library/session.php on line 11
  PHP Warning:  session_start() [&lt;a href='function.session-start'&gt;function.session-start&lt;/a&gt;]: Cannot send session cache limiter - headers already sent (output started at public_html/index.php:104) in public_html/system/library/session.php on line 11
  PHP Warning:  Cannot modify header information - headers already sent by (output started at public_html/index.php:104) in public_html/index.php on line 177
  PHP Warning:  Cannot modify header information - headers already sent by (output started at public_html/index.php:104) in public_html/vqmod/vqcache/vq2-system_library_currency.php on line 45
  </code></pre>