ImportError: DLL load failed: %1 is not a valid Win32 application.

I'm trying to run an eyetracker experiment using a Tobii eyetracker. I get the following error:

File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\libqtopensesame\misc\process.py", line 158, in run
  exp.run()
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\libopensesame\experiment.py", line 470, in run
  self.items.execute(self.var.start)
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\libopensesame\item_store.py", line 103, in execute
  self.run(name)
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\libopensesame\item_store.py", line 122, in run
  self[name].run()
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\libopensesame\sequence.py", line 51, in run
  self.experiment.items.run(_item)
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\libopensesame\item_store.py", line 122, in run
  self[name].run()
 File "C:\Program Files (x86)\OpenSesame\share\opensesame_plugins\pygaze_init\pygaze_init.py", line 231, in run
  **kwdict)
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\pygaze\eyetracker.py", line 103, in __init__
  from pygaze._eyetracker.libtobii import TobiiProTracker
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\pygaze\_eyetracker\libtobii.py", line 9, in <module>
  import tobiiresearch.implementation.EyeTracker as tr
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\tobiiresearch\implementation\EyeTracker.py", line 1, in <module>
  from tobiiresearch.interop import interop
 File "C:\Program Files (x86)\OpenSesame\Lib\site-packages\tobiiresearch\interop\interop.py", line 11, in <module>
  from tobiiresearch.interop.python3 import tobii_research_interop
ImportError: DLL load failed: %1 is not a valid Win32 application.

Any ideas where this error comes from and how I can fix it?