Collection won't show in control panel

I've created a collection named blog with the following settings:

title: Blog
order: date
fieldset: default
template: blog

In the control panel I can't access the collection list. I get an empty list with the loading circle and the following message at the bottom:

There was an issue fetching your data. More detail can be found in your logs.

Unfortunately there is no message in the log files. I am not sure how to debug this.

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