dreamca4er opened a new issue #8514:
URL: https://github.com/apache/airflow/issues/8514
**Apache Airflow version**: 1.10.7
**Kubernetes version (if you are using kubernetes)** (use `kubectl version`):
**Environment**: local
- **Cloud provider or hardware configuration**: 3Ghz Intel Core i5, 16GB
- **OS** (e.g. from /etc/os-release): Debian 9
- **Kernel** (e.g. `uname -a`): Linux debian 4.9.0-12-amd64 #1 SMP Debian
4.9.210-1 (2020-01-20) x86_64 GNU/Linux
- **Install tools**:
- **Others**:
**What happened**:
Traceback (most recent call last):
File "/usr/local/bin/airflow", line 26, in <module>
from airflow.bin.cli import CLIFactory
File "/usr/local/lib/python3.6/site-packages/airflow/bin/cli.py", line 71,
in <module>
from airflow.www_rbac.app import cached_app as cached_app_rbac
File "/usr/local/lib/python3.6/site-packages/airflow/www_rbac/app.py",
line 26, in <module>
from flask_appbuilder import AppBuilder, SQLA
File
"/usr/local/lib/python3.6/site-packages/flask_appbuilder/__init__.py", line 6,
in <module>
from .base import AppBuilder # noqa: F401
File "/usr/local/lib/python3.6/site-packages/flask_appbuilder/base.py",
line 8, in <module>
from .api.manager import OpenApiManager
File
"/usr/local/lib/python3.6/site-packages/flask_appbuilder/api/manager.py", line
7, in <module>
from flask_appbuilder.baseviews import BaseView
File
"/usr/local/lib/python3.6/site-packages/flask_appbuilder/baseviews.py", line
21, in <module>
from .forms import GeneralModelConverter
File "/usr/local/lib/python3.6/site-packages/flask_appbuilder/forms.py",
line 17, in <module>
from .fieldwidgets import (
File
"/usr/local/lib/python3.6/site-packages/flask_appbuilder/fieldwidgets.py", line
3, in <module>
from wtforms.widgets import html_params, HTMLString
ImportError: cannot import name 'HTMLString'
<!-- What do you think went wrong? -->
It seems that after the release of WTForms==2.3.0 webserver doesnt start
Changing it back to WTForms==2.2.1 solves the issue
**How to reproduce it**:
Use WTForms==2.3.0
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