Struggled with this for a few hours today, trying to get the awesome FirePHP working with a custom CMS based on Kohana 2.3 but was getting the following cryptic error message:

Fatal error: Exception thrown without a stack frame in Unknown on line 0

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Simple error to fix.. You just need to add in a blank function to FirePHP_Fake.php Codeigniters Library.

public function error() {
}