Error "Uh oh, an error occurred on the server. "

Dear guys,

Since last Friday an error has being occurring when generating the chart by using the API:

“plotly.exceptions.PlotlyRequestError: Uh oh, an error occurred on the server.”

My credentials are correct. Even this simple code is not working:

import plotly.plotly as py
from plotly.graph_objs import *

trace0 = Scatter(
x=[1, 2, 3, 4],
y=[10, 15, 13, 17]
)
trace1 = Scatter(
x=[1, 2, 3, 4],
y=[16, 5, 11, 9]
)
data = Data([trace0, trace1])
py.plot(data, filename = ‘basic-line’)

Do you guys know if there is a problem in Plotly server?