TestShadow.py not working

[goferito]

This file doesn't work. I assume I got everything properly installed since other Test files work fine.
I copy the error Traceback:

Traceback (most recent call last):
  File "TestShadows.py", line 94, in <module>
    TestShadows().run()
  File "/home/goferito/three.py/three.py/core/Base.py", line 51, in run
    self.initialize()
  File "TestShadows.py", line 36, in initialize
    directionalLight.enableShadows(strength=0.5)
  File "/home/goferito/three.py/three.py/lights/DirectionalLight.py", line 70, in enableShadows
    self.shadowRenderTarget = RenderTarget.RenderTarget( size[0], size[1] )
  File "/home/goferito/three.py/three.py/core/RenderTarget.py", line 33, in __init__
    glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, self.textureID, 0)
  File "/usr/local/lib/python3.6/dist-packages/OpenGL/platform/baseplatform.py", line 402, in __call__
    return self( *args, **named )
  File "/usr/local/lib/python3.6/dist-packages/OpenGL/error.py", line 232, in glCheckError
    baseOperation = baseOperation,
OpenGL.error.GLError: GLError(
	err = 1282,
	description = b'invalid operation',
	baseOperation = glFramebufferTexture,
	cArguments = (
		GL_FRAMEBUFFER,
		GL_COLOR_ATTACHMENT0,
		1,
		0,
	)
)