Consistent Unnamed Error

[M. Yarkin ERgin]

Hello,

I am encountering a problem.

Whenever I try to preview my study, I get this pop-up:





Normally, I'd get a syntax error or two at trial templates or procedure, but this after all of that's done. All errors due stimuli name not matching, response csv, etc. all that is fine.

Details of the experiment: just a bunch of written sentences being displayed as stimuli in each trial, and an audio response is recorded.
I suspect it has to do with my response items, because stimuli are literally just basic sentences. I am including definitions for both my response and a generic stimulus 

response:

Code:

{
  "type": "audio",
  "instruction": "Okuyuşunuzdan memnun olduktan sonra \"boşluk\" tuşuna basarak bir sonraki cümleye geçebilirsiniz.",
  "rerecording_allowed": false,
  "volume_visualizer": true,
  "alignment": "center",
  "onset_detection": true,
  "padding": 1000,
  "auto_start": true,
  "key_stop": " "
}

stimulus:

Code:

{
  "type": "text",
  "content": "Zürafayı gördü fil.",
  "alignment": "center",
  "size": "50px",
  "delay": 1
}

}Would greatly appreciate help or guidance with respect to what could be causing this unexpected error.

Thank you
M. Yarkın Ergin