I don't know why the ISTAC plugin for QGIS doesn't work. I get the following error message:

TypeError: string indices must be integers, not 'str'
Traceback (most recent call last):
File "C:\Users/Pilar/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\istacqgis\BaseDialog.py", line 95, in getCbSubjects
self.setCbIndicators(subject)
File "C:\Users/Pilar/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\istacqgis\BaseDialog.py", line 107, in setCbIndicators
indicators_title_es = {indicator["id"]: indicator["title"]["es"] for indicator in indicators['items']}
~~~~~~~~~~^^^^^^^^^
TypeError: string indices must be integers, not 'str'