bare "seq align" throws traceback

[Elaine Meng]

The following bug report has been submitted:
Platform:        macOS-10.16-x86_64-i386-64bit
ChimeraX Version: 1.4.dev202112290158 (2021-12-29 01:58:43 UTC)
Description
command "seq align" when I did have a sequence alignment of 2 things open, although I didn't specify it in the command

Log:
> open /Users/meng/Desktop/startup.cxc

> alias reset view orient; view initial

> alias start tool show $1

> alias whereprefs info path user unversioned config

> alias captut open help:user/tutorials/binding-sites.html#cap-example

> alias previewts toolshed url https://cxtoolshed-
> preview.rbvi.ucsf.edu;toolshed reload available

> alias normalts toolshed url https://cxtoolshed.rbvi.ucsf.edu;toolshed reload
> available

> alias btut open
> https://www.cgl.ucsf.edu/home/meng/chimerax/vdocs/user/tutorials/binding-
> sites.html

> alias stut open https://www.rbvi.ucsf.edu/chimerax/data/conservation-
> coloring/conservation-coloring.html

> alias ltut open https://www.rbvi.ucsf.edu/chimerax/data/loop-modeling/loop-
> modeling.html; ui dockable false "Help Viewer"

executed startup.cxc  
UCSF ChimeraX version: 1.4.dev202112290158 (2021-12-29)  
© 2016-2021 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open /Users/meng/Desktop/startup.cxc format cmd

> alias reset view orient; view initial

> alias start tool show $1

> alias whereprefs info path user unversioned config

> alias captut open help:user/tutorials/binding-sites.html#cap-example

> alias previewts toolshed url https://cxtoolshed-
> preview.rbvi.ucsf.edu;toolshed reload available

> alias normalts toolshed url https://cxtoolshed.rbvi.ucsf.edu;toolshed reload
> available

> alias btut open
> https://www.cgl.ucsf.edu/home/meng/chimerax/vdocs/user/tutorials/binding-
> sites.html

> alias stut open https://www.rbvi.ucsf.edu/chimerax/data/conservation-
> coloring/conservation-coloring.html

> alias ltut open https://www.rbvi.ucsf.edu/chimerax/data/loop-modeling/loop-
> modeling.html; ui dockable false "Help Viewer"

executed startup.cxc  

> open 2mnr

2mnr title:  
Mechanism of the reaction catalyzed by mandelate racemase. 2. Crystal
structure of mandelate racemase At 2.5 angstroms resolution: identification of
the active site and possible catalytic residues [more info...]  
  
Chain information for 2mnr #1  
---  
Chain | Description | UniProt  
A | mandelate racemase | MANR_PSEPU  
  
Non-standard residues in 2mnr #1  
---  
MN — manganese (II) ion  
SO4 — sulfate ion  
  
2mnr mmCIF Assemblies  
---  
1| author_and_software_defined_assembly  
  

> open 4enl

4enl title:  
Crystal structure of holoenzyme refined At 1.9 angstroms resolution: trigonal-
bipyramidal geometry of the cation binding site [more info...]  
  
Chain information for 4enl #2  
---  
Chain | Description | UniProt  
A | enolase | ENO1_YEAST  
  
Non-standard residues in 4enl #2  
---  
SO4 — sulfate ion  
ZN — zinc ion  
  
4enl mmCIF Assemblies  
---  
1| author_defined_assembly  
  

> open 1muc

1muc title:  
Structure of muconate lactonizing enzyme At 1.85 angstroms resolution [more
info...]  
  
Chain information for 1muc #3  
---  
Chain | Description | UniProt  
A B | muconate lactonizing enzyme | CATB_PSEPU  
  
Non-standard residues in 1muc #3  
---  
MN — manganese (II) ion  
  
1muc mmCIF Assemblies  
---  
1| author_and_software_defined_assembly  
  

> close #3

> mmaker #2 to #1 show true

Parameters  
---  
Chain pairing | bb  
Alignment algorithm | Needleman-Wunsch  
Similarity matrix | BLOSUM-62  
SS fraction | 0.3  
Gap open (HH/SS/other) | 18/18/6  
Gap extend | 1  
SS matrix |  |  | H | S | O  
---|---|---|---  
H | 6 | -9 | -6  
S |  | 6 | -6  
O |  |  | 4  
Iteration cutoff | 2  
  
Matchmaker 2mnr, chain A (#1) with 4enl, chain A (#2), sequence alignment
score = 219.9  
Alignment identifier is 1  
Showing conservation header ("seq_conservation" residue attribute) for
alignment 1  
Hiding conservation header for alignment 1  
Chains used in RMSD evaluation for alignment 1: 2mnr #1/A, 4enl #2/A  
Showing rmsd header ("seq_rmsd" residue attribute) for alignment 1  
RMSD between 73 pruned atom pairs is 1.307 angstroms; (across all 312 pairs:
12.638)  
  
Traceback (most recent call last):  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/cmd_line/tool.py", line 297, in execute  
cmd.run(cmd_text)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 2853, in run  
prev_annos = self._process_positional_arguments()  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 2629, in
_process_positional_arguments  
value, text = self._parse_arg(anno, text, session, False)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 2488, in _parse_arg  
value, replacement, rest = annotation.parse(text, session)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 890, in parse  
return anno.parse(text, session)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/atomic/args.py", line 159, in parse  
token, used, rest = next_token(text)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 1816, in next_token  
assert text and not text[0].isspace()  
AssertionError  
  
AssertionError  
  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 1816, in next_token  
assert text and not text[0].isspace()  
  
See log for complete Python traceback.  
  




OpenGL version: 4.1 Metal - 76.1
OpenGL renderer: Apple M1 Pro
OpenGL vendor: AppleHardware:

    Hardware Overview:

      Model Name: MacBook Pro
      Model Identifier: MacBookPro18,1
      Processor Name: Unknown
      Processor Speed: 2.4 GHz
      Number of Processors: 1
      Total Number of Cores: 10
      L2 Cache: 20 MB
      Memory: 16 GB

Software:

    System Software Overview:

      System Version: macOS 12.0.1 (21A559)
      Kernel Version: Darwin 21.1.0
      Time since boot: 1:50

Graphics/Displays:

    Apple G13X:

      Chipset Model: Apple G13X
      Type: GPU
      Bus: Built-In
      Total Number of Cores: 16
      Vendor: Apple (0x106b)
      Metal Family: Supported, Metal GPUFamily Apple 7
      Displays:
        Color LCD:
          Display Type: Built-in Liquid Retina XDR Display
          Resolution: 3456 x 2234 Retina
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Automatically Adjust Brightness: No
          Connection Type: Internal

Locale: (None, 'UTF-8')
PyQt5 5.15.2, Qt 5.15.2
Installed Packages:
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    appdirs: 1.4.4
    appnope: 0.1.2
    Babel: 2.9.1
    backcall: 0.2.0
    blockdiag: 2.0.1
    certifi: 2021.5.30
    cftime: 1.5.1.1
    charset-normalizer: 2.0.9
    ChimeraX-AddCharge: 1.2.2
    ChimeraX-AddH: 2.1.11
    ChimeraX-AlignmentAlgorithms: 2.0
    ChimeraX-AlignmentHdrs: 3.2
    ChimeraX-AlignmentMatrices: 2.0
    ChimeraX-Alignments: 2.2.3
    ChimeraX-AlphaFold: 1.0
    ChimeraX-AltlocExplorer: 1.0.1
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Arrays: 1.0
    ChimeraX-Atomic: 1.32
    ChimeraX-AtomicLibrary: 5.0
    ChimeraX-AtomSearch: 2.0
    ChimeraX-AtomSearchLibrary: 1.0
    ChimeraX-AxesPlanes: 2.1
    ChimeraX-BasicActions: 1.1
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 2.0
    ChimeraX-BondRot: 2.0
    ChimeraX-BugReporter: 1.0
    ChimeraX-BuildStructure: 2.6.1
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.1
    ChimeraX-ButtonPanel: 1.0
    ChimeraX-CageBuilder: 1.0
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.2
    ChimeraX-ChemGroup: 2.0
    ChimeraX-Clashes: 2.2.2
    ChimeraX-ColorActions: 1.0
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.5
    ChimeraX-CommandLine: 1.1.5
    ChimeraX-ConnectStructure: 2.0
    ChimeraX-Contacts: 1.0
    ChimeraX-Core: 1.4.dev202112290158
    ChimeraX-CoreFormats: 1.1
    ChimeraX-coulombic: 1.3.2
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0
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    ChimeraX-Dicom: 1.0
    ChimeraX-DistMonitor: 1.1.5
    ChimeraX-Dssp: 2.0
    ChimeraX-EMDB-SFF: 1.0
    ChimeraX-ExperimentalCommands: 1.0
    ChimeraX-FileHistory: 1.0
    ChimeraX-FunctionKey: 1.0
    ChimeraX-Geometry: 1.1
    ChimeraX-gltf: 1.0
    ChimeraX-Graphics: 1.1
    ChimeraX-Hbonds: 2.1.2
    ChimeraX-Help: 1.2
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.1
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    ChimeraX-Toolbar: 1.1
    ChimeraX-ToolshedUtils: 1.2
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    ChimeraX-UI: 1.15.2
    ChimeraX-uniprot: 2.2
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    ChimeraX-ViewDockX: 1.0.1
    ChimeraX-VIPERdb: 1.0
    ChimeraX-Vive: 1.1
    ChimeraX-VolumeMenu: 1.0
    ChimeraX-VTK: 1.0
    ChimeraX-WavefrontOBJ: 1.0
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    nest-asyncio: 1.5.4
    netCDF4: 1.5.7
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    packaging: 21.0
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