Localhost: The JSON response from the API could not be parsed

I’m a beginner, so I would say, that I’ll use basic-stuff only. No hooks, only the config.php like shown in the other thread.

The Network-Tab looks good. But the console does not. But this is saying nothing to me as a newbie…

console-export

Error: The JSON response from the API could not be parsed. Please check your API connection.
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promise callbackr https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:6
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promise callback
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request https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/app.js:1
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fetch https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/app.js:1
created https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/app.js:1
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init https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
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(Async: promise callback)
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(Async: promise callback)
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fetch https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/app.js:1
created https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/app.js:1
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a https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
sn https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
init https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
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p https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
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Io https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
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run https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
Zn https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
ge https://localhost/rcmc/media/panel/6c7cf65934d9cb4da34dd7f174cb8bab/js/vendor.js:23
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