Error message in typo3 backend: “Wrong configuration in table xxx”

PROBLEM

Error message in typo3 backend: "Wrong configuration in table xxx"
https://github.com/FluidTYPO3/flux/issues/478

CAUSE

You want to use an image via FAL in your extension with the following code
<flux:form.section name="slides">
    <flux:form.object name="slide">
        <flux:field.inline.fal name="settings.images" multiple="FALSE" maxItems="1"/>
    </flux:form.object>
</flux:form.section>

SOLUTION

This is a bug in the typo3 core. 
https://forge.typo3.org/issues/57956
There is no solution as of typo3 version 6.2.14 or 6.2.15.
Maybe it will be fixed in later versions?
Maybe it is fixed in typo3 version 7.x?

WORKAROUND

Don't use image via FAL in your extension.
Use the old, legacy approach, given in the following code

<flux:form.section name="slides">
    <flux:form.object name="slide">
        <flux:field.file name="image" label="Bild" allowed="jpg, jpeg, png, gif" maxItems="1" showThumbnails="1"/>
    </flux:form.object>
</flux:form.section>

LINKS

https://github.com/FluidTYPO3/flux/issues/478
https://forge.typo3.org/issues/57956

Veraltet