Unable to create new membership type

When trying to create a new membership type, I get this error:

Membership Types

unrecoverable error
Sorry. A non-recoverable error has occurred.

QuickForm Error: nonexistent html element

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Error Details:

Array
(
[callback] => Array
(
[0] => CRM_Core_Error
[1] => handle
)

[code] => -3
[message] => QuickForm Error: nonexistent html element
[mode] => 16
[debug_info] => Element 'uploadFile' does not exist in HTML_QuickForm::getElement()
[type] => HTML_QuickForm_Error
[user_info] => Element 'uploadFile' does not exist in HTML_QuickForm::getElement()
[to_string] => [html_quickform_error: message="nonexistent html element" code=-3 mode=callback callback=CRM_Core_Error::handle prefix="QuickForm Error: " info="Element 'uploadFile' does not exist in HTML_QuickForm::getElement()"]
)

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