TYPO3 Core

I get a fatal error if I hit the submit button.

( ! ) Fatal error: Call to a member function getValue() on a non-object in /home/phil/t3-playground/t3-git/typo3/sysext/form/Classes/Domain/Model/Attributes/Attributes.php on line 154
Call Stack
#    Time    Memory    Function    Location
1    0.0003    660504    {main}( )    ../index.php:0
2    0.0017    865048    require( '/home/phil/t3-playground/t3-git/typo3/sysext/cms/tslib/index_ts.php' )    ../index.php:84
3    0.1691    26427536    tslib_fe->INTincScript( )    ../index_ts.php:431
4    0.1691    26428032    tslib_fe->INTincScript_process( )    ../class.tslib_fe.php:3144
5    0.1702    26619968    tslib_cObj->COBJ_ARRAY( )    ../class.tslib_fe.php:3204
6    0.1702    26620048    tslib_content_ContentObjectArray->render( )    ../class.tslib_content.php:738
7    0.1702    26620128    tslib_cObj->cObjGet( )    ../class.tslib_content_contentobjectarray.php:48
8    0.1703    26620720    tslib_cObj->cObjGetSingle( )    ../class.tslib_content.php:548
9    0.1703    26621056    tx_form_Controller_Form->cObjGetSingleExt( )    ../class.tslib_content.php:594
10    0.1729    27107616    tx_form_Controller_Form->execute( )    ../Form.php:133
11    0.1759    27380304    tx_form_Controller_Form->doPostProcessing( )    ../Form.php:155
12    0.1955    29289064    tx_form_System_Postprocessor->process( )    ../Form.php:286
13    0.2449    31646784    tx_form_System_Postprocessor_Mail->process( )    ../Postprocessor.php:72
14    0.2643    32019952    tx_form_System_Postprocessor_Mail->setPlainContent( )    ../Mail.php:91
15    0.2661    32051792    tx_form_View_Mail_Plain->render( )    ../Mail.php:279
16    0.2661    32051792    tx_form_View_Mail_Plain_Element_Container->renderChildren( )    ../Plain.php:49
17    0.2735    32175824    tx_form_View_Mail_Plain_Element_Container->renderChild( )    ../Container.php:43
18    0.2736    32176712    tx_form_View_Mail_Plain_Element_Fieldset->render( )    ../Container.php:63
19    0.2736    32176848    tx_form_View_Mail_Plain_Element_Container->renderChildren( )    ../Fieldset.php:57
20    0.2742    32192480    tx_form_View_Mail_Plain_Element_Container->renderChild( )    ../Container.php:43
21    0.2748    32211456    tx_form_View_Mail_Plain_Element_Fileupload->render( )    ../Container.php:63
22    0.2749    32211496    tx_form_View_Mail_Plain_Element_Fileupload->getValue( )    ../Fileupload.php:48
23    0.2749    32211576    tx_form_Domain_Model_Element_Abstract->getAttributeValue( )    ../Fileupload.php:70
24    0.2749    32211576    tx_form_Domain_Model_Attributes_Attributes->getValue( )    ../Abstract.php:318

This is my form:

prefix = tx_form
confirmation = 0
postProcessor {
    1 = mail
    1 {
        recipientEmail = phil@localhost.localdomain
        senderEmail = phil@localhost.localdomain
    }
}
10 = HEADER
10 {
    class = content-header
    headingSize = h1
    content = Form header
}
20 = TEXTLINE
20 {
    name = easfsdf
    label {
        value = Another (changed) label
    }
}
30 = TEXTLINE
30 {
    name = email
    label {
        value = Email
    }
}
40 = CHECKBOXGROUP
40 {
    class = fieldset-subgroup
    legend {
        value = Edit this legend
    }
    name = test
    10 = CHECKBOX
    10 {
        label {
            value = Option 1
        }
    }
    20 = CHECKBOX
    20 {
        label {
            value = Option 2
        }
    }
    30 = CHECKBOX
    30 {
        label {
            value = Option 3
        }
    }
}
50 = FIELDSET
50 {
    class = predefined-name fieldset-subgroup fieldset-horizontal label-below
    legend {
        value = Full name
    }
    10 = TEXTLINE
    10 {
        label {
            value = Prefix
        }
        name = prefix
        size = 4
        layout (
            <input />
            <label />
        )
    }
    20 = TEXTLINE
    20 {
        label {
            value = First name
        }
        name = firstName
        size = 10
        layout (
            <input />
            <label />
        )
    }
    30 = TEXTLINE
    30 {
        label {
            value = Middle name
        }
        name = middleName
        size = 6
        layout (
            <input />
            <label />
        )
    }
    40 = TEXTLINE
    40 {
        label {
            value = Last name
        }
        name = lastName
        size = 15
        layout (
            <input />
            <label />
        )
    }
    50 = TEXTLINE
    50 {
        label {
            value = Suffix
        }
        name = suffix
        size = 4
        layout (
            <input />
            <label />
        )
    }
}
60 = RADIOGROUP
60 {
    class = fieldset-subgroup
    legend {
        value = Edit this legend
    }
    name = test
    10 = RADIO
    10 {
        label {
            value = Option 1
        }
    }
    20 = RADIO
    20 {
        label {
            value = Option 2
        }
    }
    30 = RADIO
    30 {
        label {
            value = Option 3
        }
    }
}
70 = TEXTAREA
70 {
    cols = 40
    rows = 55
    name = text area
    label {
        value = Edit this label
    }
}
80 = PASSWORD
80 {
    name = 21
    label {
        value = Edit this label
    }
}
90 = FIELDSET
90 {
    legend {
        value = Edit this legend
    }
    10 = HIDDEN
    10 {
        name = 23
    }
    20 = FILEUPLOAD
    20 {
        name = 24
        label {
            value = Edit this label
        }
    }
    30 = SELECT
    30 {
        name = 25
        label {
            value = Edit this label
        }
        10 = OPTION
        10 {
            data = Option 1
        }
        20 = OPTION
        20 {
            data = Option 2
        }
        30 = OPTION
        30 {
            data = Option 3
        }
    }
    40 = RESET
    40 {
        value = Clear form
    }
}
100 = SUBMIT
100 {
    name = 27
    value = Submit form
}
rules {
    1 = required
    1 {
        breakOnError = 0
        showMessage = 1
        message = Required
        error = This field is required
        element = email
    }
    2 = email
    2 {
        breakOnError = 0
        showMessage = 1
        message = (john.doe@domain.com)
        error = This is not a valid email address
        element = email
    }
    3 = required
    3 {
        breakOnError = 0
        showMessage = 1
        message = *
        error = Required
        element = firstName
    }
    4 = required
    4 {
        breakOnError = 0
        showMessage = 1
        message = *
        error = Required
        element = lastName
    }
    5 = length
    5 {
        breakOnError = 0
        showMessage = 1
        message = The length of the value must have a minimum of %minimum characters
        error = The value is less than %minimum characters long
        minimum = 0
        maximum = 0
        element = text area
    }
}