Help when customizing the standard mail files with HTML/CSS?

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Hey,

I am come across an error when adding a custom table with images etc within the mail files that get sent to users, for example if i custom the 'forgot_password.php' with custom HTML/CSS when users submit there email address it displays the following error within the browser....

Warning: vsprintf() [function.vsprintf]: Too few arguments in /Applications/MAMP/htdocs/bbbr/concrete/libraries/localization.php  on line 44
Warning: Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/bbbr/concrete/libraries/localization.php:44) in /Applications/MAMP/htdocs/bbbr/concrete/libraries/controller.php on line 333


If I then remove all the custom coding it works again, i think it likes teasing me :'(

Any help would be much-ly appreciated :)

ChrisWatterston