flask.ext is now deprecated (Flask 0.11)

[kevinvalk]

New (really it is an old way) to import package is done using flask_packagename. Please change from flask.ext import script to import flask_script

flask_assets.py@345

    from flask.ext import script
except ImportError:
    pass
else:
    import argparse
    from webassets.script import GenericArgparseImplementation, CommandError

Sources
pallets/flask#1182
pallets/flask#1484
pallets/flask#1135

[kevinvalk]

Sorry, this has already been fixed...