Hello!
I am new to MODx, but i like it very much

Im using MODx 0.9.5
My problem is:
I edited the contactForm-chunk in order to get my language and the specific strings. All worked fine, i wrote test-mails and after editing the gotoid all was fine, but after then it brokes.
ContactForm-Chunk:
<p class="error">[+validationmessage+]</p>
<form method="post" action="[~[*id*]~]" id="EmailForm" name="EmailForm">
<fieldset>
<h3>Kontakt mit dem Webmaster</h3>
(Nachrichten werden zwar weitergeleitet, aber sinnvoller ist es, den <a href="http://xxxxxx.xxx/mx/index.php?id=61">Vorstand</a> anzuschreiben.)<br>
<br>
<input name="formid" type="hidden" value="ContactForm" />
<div style="width:400px;margin-left:auto;margin-right:auto;text-align:left">
<label for="cfName">Ihr Name:
<input name="name" id="cfName" class="text" type="text" eform="Your Name::1:" /> </label>
<br>
<label for="cfEmail">Ihre Email-Adresse:
<input name="email" id="cfEmail" class="text" type="text" eform="Email Address:email:1" /> </label>
<br>
<label for="cfRegarding">Betreffend:</label>
<select name="subject" id="cfRegarding" eform="Form Subject::1">
<option value="Generelle Frage">Generelle Frage</option>
<option value="Presseanfrage">Presseanfrage</option>
<option value="Zusammenarbeit">Zusammenarbeit</option>
<option value="xxxx">xxxx</option>
</select>
<br>
<label for="cfMessage">Ihre Nachricht:</label><br>
<textarea name="message" id="cfMessage" background="#f5f5f5" rows="10" cols="40" eform="Message:textarea:1"></textarea>
<br>
<label> </label><input type="submit" name="contact" id="cfContact" class="button" value="Abschicken" />
</div>
</fieldset>
</form>
The Call:
[[ContactForm? &sendTo=`[(emailsender)]`]]
[!eForm? &formid=`ContactForm` &subject=`[+subject+]` &to=`[(email_sender)]` &ccsender=`1` &tpl=`ContactForm` &report=`ContactFormReport` &gotoid=`1`!]
And my problem:
Could not instantiate mail function.
After searching this forum i read about manipulating the php-code, but i didnt find anything, only the chunk and thats HTML. Have i to take a look at the php-code from eForm?
Had anyone the same problem or a solution for me?