Title: header replaced with error message Last modified: August 19, 2016 --- # header replaced with error message * [rhusari](https://wordpress.org/support/users/rhusari/) * (@rhusari) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/) * I’m getting the following messages in place of the header – just out of the blues. Why is it so and how do I fix it? Thanks. * Warning: session_start() [function.session-start]: open(/tmp/sess_72a914496ae756efee52833739f6c3af, O_RDWR) failed: No space left on device (28) in /home/website/public_html/wp- content/plugins/sidebar-login/sidebar-login.php on line 1 * Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/website/public_html/wp- content/plugins/sidebar-login/sidebar-login.php:1) in /home/website/public_html/ wp-content/plugins/sidebar-login/sidebar-login.php on line 1 Viewing 10 replies - 1 through 10 (of 10 total) * [datasoftict](https://wordpress.org/support/users/datasoftict/) * (@datasoftict) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1824930) * ‘No space left on device’ usually indicates a resource problem, either disk or memory. I would contact your hosting company first. It looks as though the file can’t be created that carries your session information, and it will have happened as the space ran out, so as you say out of the blue. * Thread Starter [rhusari](https://wordpress.org/support/users/rhusari/) * (@rhusari) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825102) * host has no input. Any other ideas? * [Rev. Voodoo](https://wordpress.org/support/users/rvoodoo/) * (@rvoodoo) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825103) * if you go to the plugin editor, and view the sidebar-login plugin’s sidebar-login. php file, are there any blank lines or blank spaces at the top? * If so delete them. * Thread Starter [rhusari](https://wordpress.org/support/users/rhusari/) * (@rhusari) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825107) * checked that already. no blank lines or spaces. first line is this: * Thread Starter [rhusari](https://wordpress.org/support/users/rhusari/) * (@rhusari) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825222) * My host said they had cleared space on the server so the error message disappeared from the home page but it still pops up on the dashboard page. How do you interpret that? * [datasoftict](https://wordpress.org/support/users/datasoftict/) * (@datasoftict) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825249) * > How do you interpret that? * Surprised? * Is it a ‘No space left on device’ error on the dashboard? * Try deactivating all plugins and see if there is a plugin using extra resources. Can you get an idea from your control panel of your space/memory usage? * Thread Starter [rhusari](https://wordpress.org/support/users/rhusari/) * (@rhusari) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825250) * Thanks datasoftict. According to my cpanel disk space usage is: 157.38 / 50000 MB I insisted with my host that the problem is with the /tmp filesystem and was only solved partially when they did some cleaning on the server. They seem to have done something about it. The message finally disappeared from my dashboard for now. I’ll see if it reappears. thanks again * Thread Starter [rhusari](https://wordpress.org/support/users/rhusari/) * (@rhusari) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825251) * sorry that was too fast…it is still appearing on the dashboard page. This is what I’m getting: Warning: session_start() [function.session-start]: open(/tmp/ sess_9ef566cddccf18373d3e75cc543a1826, O_RDWR) failed: No space left on device( 28) in /home/website/public_html/wp-content/plugins/sidebar-login/sidebar-login. php on line 1 * Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/iraqoilf/public_html/ wp-content/plugins/sidebar-login/sidebar-login.php:1) in /home/website/public_html/ wp-content/plugins/sidebar-login/sidebar-login.php on line 1 * [datasoftict](https://wordpress.org/support/users/datasoftict/) * (@datasoftict) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825255) * I would suggest /tmp needs some maintenance! * Looking at the plugin I can’t see anything to cause it to fail (it works OK on my test sites). It might use more resources in the dashboard than in the blog, but I think the answer lies with your hosting Co. * Thread Starter [rhusari](https://wordpress.org/support/users/rhusari/) * (@rhusari) * [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825274) * You are right. They have sorted it out. It was good to insist they do something with /tmp. Thanks for the help. Viewing 10 replies - 1 through 10 (of 10 total) The topic ‘header replaced with error message’ is closed to new replies. ## Tags * [header](https://wordpress.org/support/topic-tag/header/) * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 10 replies * 3 participants * Last reply from: [rhusari](https://wordpress.org/support/users/rhusari/) * Last activity: [15 years, 4 months ago](https://wordpress.org/support/topic/header-replaced-with-error-message/#post-1825274) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics