#1115 – Unknown character set: ‘utf8mb4’

WordPress does not support MySQL 4 : To run WordPress your host just needs a couple of things: MySQL version 5.0 or greater (recommended: MySQL 5.5 or greater) https://wordpress.org/about/requirements/ While the utf8mb4 encoding is recent change and you might work around it, overall you still need compatible MySQL version.

Getting headers already sent error from plugin

If you look at the source of the page you will see this around line 122: <div class=”nav-collapse collapse”> <br /> <b>Warning</b>: session_start() [<a href=”https://wordpress.stackexchange.com/questions/105453/function.session-start”>function.session-start</a>]: Cannot send session cookie – headers already sent by (output started at /home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-includes/functions.php:2841) in <b>/home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-content/plugins/osu-royaltfreemusic/osu-royaltyfreemusic.php</b> on line <b>225</b><br /> <br /> <b>Warning</b>: session_start() [<a href=”https://wordpress.stackexchange.com/questions/105453/function.session-start”>function.session-start</a>]: Cannot send session cache limiter … Read more

Displaying oEmbed errors?

Not possible with current code. WP_oEmbed object goes extra mile (more like miles) to sanitize input so it is either html or boolean false. All errors with fetching are discarded on output, there are no filters in there and only error (hardcoded) it handles is 501 not implemented. Earliest you can mess with this is … Read more

Error 101 after upgrading WordPress

Are you sure /wp-includes/load.php made it to the server? If you were installing manually, there’s a chance it got lost during the transfer. Happens to me occasionally using FileZilla. The error messages are basically telling you that the server can’t find the file, so make sure the file is there.

This webpage is not available ERR_NAME_NOT_RESOLVED

Those settings are stored in the wp_options table in the database. If you can access the database with PHPMyAdmin Location the wp_options table and find the records with the option_name of home and siteurl and change it back to the correct url. Your host may also be willing to help with this.