TypeError: sequence item 0: expected string, Fragment found

[anonymous]

==== How to Reproduce

While doing a GET operation on `/ticket/3`, Trac issued an internal error.

''(please provide additional details here)''
1. After simplemultiproject turned on then I don't see the tickets and can't create ticket
2. Also related problem is 

{{{
Error: Not Found
Unknown administration panel
}}}
..when clicking new created project

- I'm using plugin manager for admin, also not experimenting inside .ini

Request parameters:
{{{
{'id': u'3'}
}}}

User agent: `#USER_AGENT#`

==== System Information
''System information not available''

==== Enabled Plugins
''Plugin information not available''

==== Interface Customization
''Interface customization information not available''

==== Python Traceback
{{{
Traceback (most recent call last):
  File "venvp27/lib/python2.7/site-packages/trac/web/main.py", line 639, in dispatch_request
    dispatcher.dispatch(req)
  File "venvp27/lib/python2.7/site-packages/trac/web/main.py", line 271, in dispatch
    method=method)
  File "venvp27/lib/python2.7/site-packages/trac/web/chrome.py", line 1443, in render_template
    fragment, iterable, method)
  File "venvp27/lib/python2.7/site-packages/trac/web/chrome.py", line 1517, in _render_jinja_template
    data):
  File "venvp27/lib/python2.7/site-packages/trac/web/chrome.py", line 1930, in _check_for_stream_filters
    stream, data)
  File "venvp27/lib/python2.7/site-packages/workflow_actionbuttons/web_ui.py", line 39, in filter_stream
    buttons.append(manager.render_action_button(req, data['ticket'], action))
  File "venvp27/lib/python2.7/site-packages/workflow_actionbuttons/api.py", line 64, in render_action_button
    label, widgets, hints = self.render_action_control(req, ticket, action)
  File "venvp27/lib/python2.7/site-packages/workflow_actionbuttons/api.py", line 37, in render_action_control
    return first_label, tag(*widgets), (hints and '. '.join(hints) or '')
TypeError: sequence item 0: expected string, Fragment found
}}}

System Information
Package	Version
Trac	1.4.3
Babel	2.9.1
Genshi	0.7.5 (with speedups)
GIT	2.28.0
Jinja2	2.11.3
Pygments	2.5.2
pysqlite	2.6.0
Python	2.7.18 (default, Oct 29 2020, 17:28:54) [GCC FreeBSD Clang 10.0.1 (git@github.com:llvm/llvm-project.git llvmorg-10.0.1-
pytz	2021.1
setuptools	44.1.1
SQLite	3.33.0

[Jun Omae]

PluginIssue (​th:SimpleMultiProjectPlugin).

[Jun Omae]

  File "venvp27/lib/python2.7/site-packages/workflow_actionbuttons/api.py", line 37, in render_action_control
    return first_label, tag(*widgets), (hints and '. '.join(hints) or '')
TypeError: sequence item 0: expected string, Fragment found

That is due to ​th:WorkflowActionButtonsPlugin.

[anonymous]

After workflow_actionbuttons.* = disabled I can create tickets but not see any of all on whole lists reports. Only when filed is indicated for ticket number by custom query.

[Jun Omae]

… but not see any of all on whole lists reports. Only when filed is indicated for ticket number by custom query.

PluginIssue (​th:SimpleMultiProjectPlugin).