Help. I am getting error codes

I practically get error codes when i post new listing and when i activate the QRcode plugin. + all my listing images are not the same size. Please help me sort this out.

@MilkyMaine
Please provide additional details.
http://forums.mb-themes.com/zara-osclass-responsive-theme/general-rules-20/

@frosticek
Okay..  The link below show the image of the error i get always whenever i activate the qrcode plugin for use. 

@MilkyMaine
Reinstall QR code plugin.

@frosticek
That was the very first thing i did. Still im getting same error.

Though i will try it again.

Okay. I just uninstalled then deleted it from the dir. >> then i re-uploadedand re-installed. Now working.

Second issue is described below.

@MilkyMaine
Where?

These error codes occur when a user tries to post a new listing. First i thought about the spam killer plugin but then again. The listings show up on the pages later on. But why does it output those error codes instead of a "post success" message?

@MilkyMaine
You need to ask those questions author of that plugin, there is no reference to theme.

Oh really ? I will. How about the third line??

@MilkyMaine
Is there any reference to theme?
Such errors are usually caused by whitespaces outside <?php ?> tags in plugins.