Web services

Below is the code, i am executing on cloud.

Always getting following error
EXCEPTION class="invalid_parameter_exception"><ERRORCODE>invalidparameter</ERRORCODE><MESSAGE>Invalid parameter value detected</MESSAGE></EXCEPTION>


<form action="http://digitallearningmoodle.MoodleCloud.com/webservice/rest/server.php/wsfunction=enrol_manual_enrol_users&moodlewsrestformat=json&wstoken=45b7e15836cd1ed6befcb1f930b6a300">
        <input type="text" name="wstoken" value="45b7e15836cd1ed6befcb1f930b6a300" /><br />
        Role:<input type="text" name="enrolments[0][roleid]" value='5' /> <br />
        User<input type="text" name="enrolments[0][userid]" value='5' /> <br />
        Course<input type="text" name="enrolments[0][courseid]" value='3' /> <br />
        <input type="submit" value="submit" />
    </form>
   
    User Creation
    <form name="form2" action="http://digitallearningmoodle.moodlecloud.com/webservice/rest/server.php/wsfunction=core_user_create_users&moodlewsrestformat=json&wstoken=c41045274cef714c5c79de2bc5102141">
        <input type="text" name="wstoken" value="c41045274cef714c5c79de2bc5102141" /><br />
        username:<input type="text" name="users[0][username]" value='campbell055' /> <br />
        User first name<input type="text" name="users[0][firstname]" value='apifirstname' /> <br />
        User last name<input type="text" name="users[0][lastname]" value='apilastname' /> <br />
        User email<input type="text" name="users[0][email]" value='apiuseremail@gmail.com' /> <br />
        auth<input type="text" name="users[0][auth]" value='manual' /> <br />
        idnumber<input type="text" name="users[0][idnumber]" value=707 /> <br />
        city<input type="text" name="users[0][city]" value='Perth' /> <br />
        country<input type="text" name="users[0][country]" value='AU' /> <br />
        password<input type="text" name="users[0][password]" value='Password123' /> <br />
        <input type="submit" value="submit" />
    </form>