install problems with mobile joomla

Hi, i want to install
the mobile joomla componente on a customers website running on joomla 1.5.15 but the install doesn't work. The component is installed but when i click the menu link an error message is shown. Is that because of the older joomla version or is there another problem?

What is the message text?
Seems there was no significant core changes after 1.5.15...