Pygmt-session [ERROR]: Not available in classic mode

I had this error in COLAB running “fig = pygmt.Figure()” after I installed pdf2image and poppler-utils packages.

pygmt-session [ERROR]: Not available in classic mode

GMTCLibError Traceback (most recent call last)
in ()
1 import pygmt
2
----> 3 fig = pygmt.Figure()
4
5 fig.basemap(projection=“x1i”, region=[0, 7, 3, 7], frame=True)

2 frames
/usr/local/lib/python3.7/dist-packages/pygmt/clib/session.py in call_module(self, module, args)
499 if status != 0:
500 raise GMTCLibError(
–> 501 f"Module ‘{module}’ failed with status code {status}:\n{self._error_message}"
502 )
503

GMTCLibError: Module ‘figure’ failed with status code 30:
pygmt-session [ERROR]: Not available in classic mode