doesn't work?

looks like a beautiful plug in, but i cannot get it to work.
the red button gives me a ‘not found’ message.
When i go to settings>form i get this message:

[error]<h1>Reserve now![show_price style="float:right;"]</h1><h2>General information</h2><label>Arrival Date<span class="small">When will you come?</span></label><span class="row">[date-from style="width:75px"] [date-from-hour style="width:50px" value="12"]:[date-from-min style="width:50px"]</span><label>Departure Date<span class="small">When will you go?</span></label><span class="row">[date-to style="width:75px"] [date-to-hour style="width:50px" value="12"]:[date-to-min style="width:50px"]</span><label>Resource<span class="small">What do you want?</span></label>[resources]<label>Adults<span class="small">How many guests?</span></label>[adults 1 10]<label>Children’s <span class="small">With children’s?</span></label>[childs 0 10]<h2>Personal information</h2><label>Name<span class="small">What is your name?</span></label>[thename]<label>Email<span class="small">What is your email?</span></label>[email]<label>Phone<span class="small">Your phone number?</span></label>[custom text Phone *]<label>Street<span class="small">Your street?</span></label>[custom text Street *]<label>Postal code<span class="small">Your postal code?</span></label>[custom text PostCode *]<label>City<span class="small">Your city?</span></label>[custom text City *]<label>Country<span class="small">Your country?</span></label>[country]<label>Message<span class="small">Any comments?</span></label>[custom textarea Message]<label>Captcha<span class="small">Type in code</span></label>[captcha]<div style="text-align:center;">[submit Send]</div>

i also use qtranslate plugin on the same page

https://www.ads-software.com/plugins/easyreservations/