id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
18639	ChimeraX not starting on Windows Server 2016	juergen.eirich@…	Greg Couch	"{{{
Hi,

 

I tried installing ChimeraX 1.10.1 (as well as the 27. Aug. 2025 daily) on a
Windows Server 2016 64 bit system, with default settings of the setup.

 

The GUI does not start. When trying to start the console, I get the error
pasted below.

 

Python 3.11.4 is starting from the respective ChimeraX bin folder,
C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-packages\PyQt6\Qt6\bin seems
to contain the respective DLLs.

 

Do you have any hints on what might be wrong with PyQt6.QtCore?

 

Best

 

Jürgen

 

 

 

NOTE: Traceback (most recent call last):

  File ""<frozen runpy>"", line 198, in _run_module_as_main

  File ""<frozen runpy>"", line 88, in _run_code

  File ""C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-

packages\chimerax\core\\__main__.py"", line 1220, in <module>

    exit_code = init(sys.argv)

                ^^^^^^^^^^^^^^

  File ""C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-

packages\chimerax\core\\__main__.py"", line 691, in init

    from chimerax.ui import initialize_qt

  File ""C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-

packages\chimerax\ui\\__init__.py"", line 21, in <module>

    from .gui import MainToolWindow, initialize_qt, menu_capitalize,

tool_user_error

  File ""C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-

packages\chimerax\ui\gui.py"", line 29, in <module>

    from Qt.QtWidgets import QApplication

  File ""C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-

packages\Qt\\__init__.py"", line 69, in <module>

    from PyQt6.QtCore import PYQT_VERSION_STR as PYQT6_VERSION

ImportError: DLL load failed while importing QtCore: The specified procedure

could not be found.

 

 

BUG: ImportError: DLL load failed while importing QtCore: The specified
procedure

could not be found.

 

File ""C:\Program Files\ChimeraX
1.10.1\bin\Lib\site-packages\Qt\\__init__.py"",

line 69, in

from PyQt6.QtCore import PYQT_VERSION_STR as PYQT6_VERSION

 

_See log for complete Python traceback._

 

 

 <http://plantproteomics.ms/> web  <http://orcid.org/0000-0003-0963-1872>
ORCiD  <https://bsky.app/profile/plantproteomics-ms.bsky.social> bsky.social

 

Office +49 251 83 23836

Schlossplatz 7, 48149 Muenster, Germany

 

}}}

[attachment:""smime.p7s""]
"	defect	closed	normal		Platform		limitation		Tom Goddard				all	ChimeraX