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Add Target to Target Manager Database with Vuforia API

I've got an issue by using the Vuforia API and upload an image from my Server with PHP as new target to my Target Manager Database. I always get a response from Vurforia with a "result_code":"BadImage" and a "transaction_id", no matter which image I upload. How can I debug this and get further information? Can anybody help me because I can't see any problem. My request is based the following code/lib: https://github.com/jacobtabak/curl-vuforia-client/blob/master/VuforiaClient.php