The requested device appears to be a GPU, but CUDA is not enabled.

Accelerated Computing CUDA CUDA Programming and Performance
1

Here is my configuration:

Geforce RTX 2080 Ti
Cuda 10.0.130
CUDNN 7
Tensorflow 1.13.1

When I run a simple script like the following:

import tensorflow as tf
with tf.device('/gpu:0'):
	a = tf.constant([1.0, 2.0, 3.0, 4.0, 5.0, 6.0], shape=[2, 3], name='a')
	b = tf.constant([1.0, 2.0, 3.0, 4.0, 5.0, 6.0], shape=[3, 2], name='b')
	c = tf.matmul(a, b)
with tf.Session() as sess:
	print (sess.run(c))

I have the following error

Make sure the device specification refers to a valid device. The requested device appears to be a GPU, but CUDA is not enabled.
	 [[node MatMul (defined at ../script_teste.py:5) ]]

I am not using conda or virtualenv

What did I miss in my configuration?