# Error while running psychopy Builder

**URL:** <https://discourse.psychopy.org/t/error-while-running-psychopy-builder/8307>\
**Category:** Builder\
**Created:** [July 1, 2019, 6:21pm UTC](https://discourse.psychopy.org/t/error-while-running-psychopy-builder/8307 "2019-07-01T18:21:45Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sahithyan](https://avatars.discourse-cdn.com/v4/letter/s/46a35a/32.png) [@Sahithyan](https://discourse.psychopy.org/u/Sahithyan)\
**Post date:** [July 1, 2019, 6:21pm UTC](https://discourse.psychopy.org/t/error-while-running-psychopy-builder/8307/1 "2019-07-01T18:21:45Z")

</div>

\*\*OS: Win10  
\*\*PsychoPy version: 3.13  
\*\*What are you trying to achieve?: Just a simple welcome screen program

Once I click run. The builder fails to create a welcome screen and this is the error I get:

```auto
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html
Traceback (most recent call last):
  File "F:\CBCS academics\Thesis\pilot\pilot_lastrun.py", line 63, in <module>
    units='height')
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\window.py", line 386, in __init__
    self.backend = backends.getBackend(win=self, *args, **kwargs)
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\backends\ __init__.py", line 32, in getBackend
    return Backend(win, *args, **kwargs)
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\backends\pygletbackend.py", line 227, in __init__
    self._origGammaRamp = self.getGammaRamp
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\backends\pygletbackend.py", line 326, in getGammaRamp
    return getGammaRamp(self.screenID, self.xDisplay)
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\backends\gamma.py", line 128, in getGammaRamp
    raise AssertionError('GetDeviceGammaRamp failed')
AssertionError: GetDeviceGammaRamp failed
Exception ignored in: <bound method Window. __del__ of <psychopy.visual.window.Window object at 0x000002123319A2E8>>
Traceback (most recent call last):
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\window.py", line 498, in __del__
    self.close()
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\window.py", line 1282, in close
    self.backend.close() # moved here, dereferencing the window prevents
AttributeError: 'NoneType' object has no attribute 'close'

```

---

<div class="post-metadata">

**Author:** ![Sahithyan](https://avatars.discourse-cdn.com/v4/letter/s/46a35a/32.png) [@Sahithyan](https://discourse.psychopy.org/u/Sahithyan)\
**Post date:** [July 3, 2019, 7:33am UTC](https://discourse.psychopy.org/t/error-while-running-psychopy-builder/8307/2 "2019-07-03T07:33:42Z")

</div>

Help Needed !

---

<div class="post-metadata">

**Author:** ![wakecarter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/wakecarter/32/5753_2.png) [@wakecarter](https://discourse.psychopy.org/u/wakecarter)\
**Post date:** [September 16, 2019, 12:41pm UTC](https://discourse.psychopy.org/t/error-while-running-psychopy-builder/8307/3 "2019-09-16T12:41:17Z")

</div>

Hi,

I had a similar error which I discovered was due to having two screens. Try changing to “Show only on 1”. My error in full is:

OSError: The hardware look-up table (GetDeviceGammaRamp) was unable to be used. If you would like to proceed without look-up table (gamma) changes, you can set the `Window` parameter `gammaErrorPolicy` to `"warn"` or `"ignore"`.  
Exception ignored in: \<bound method Window. **del** of \<psychopy.visual.window.Window object at 0x0000021A48241BA8\>\>  
Traceback (most recent call last):  
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\window.py”, line 529, in **del**  
self.close()  
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\visual\window.py”, line 1517, in close  
self.backend.close() # moved here, dereferencing the window prevents  
AttributeError: ‘NoneType’ object has no attribute ‘close’

Best wishes,

Wakefield