Fatal error: Class 'JModelLegacy'

sorry i have another problem

Fatal error: Class 'SRFactory' not found in /web/htdocs/www.friulisitiweb.it/home/hotelvienna/components/com_solidres/controllers/reservationasset.php on line 77

i have insert my own hotel information

ok i have solved this

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sorry i have another problem

Fatal error: Class 'SRFactory' not found in /web/htdocs/www.friulisitiweb.it/home/hotelvienna/components/com_solidres/controllers/reservationasset.php on line 77

i have insert my own hotel information

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but this
it happens again:

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everything ok, but when I try to do the booking of a room (sample data) component stops processing in the state and should not be in the second step Guest info & Payment. look at the image

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please help my site url is:
www.friulisitiweb.it/hotelvienna/

thanks

ok thank you all settled for the help, just one last thing, how do I delete the reservations in the trash?

thank-you for all.

Two real last question:

where i find the text highlited in the image:

www.friulisitiweb.it/screenshot.jpg

where i find the css for modify?

many thanks