Dear Vinita, In the menu item Structure Prediction/Model Loops or Modeller Comparative there are boxes in which you insert the license key (password) – see the screenshots. Best regards Sasha From: Vinita Pant [mailto:vinipant78@gmail.com] Sent: Saturday, November 22, 2025 18:26 To: Alexandra Zahradnikova Subject: Re: [chimerax-users] Re: Problem with modeller execution location Thank you for your response. However, I did not find any option to input the MODELLER password. Since I am not very tech-savvy, could you please guide me? Thanks and Regards Vinita Pant Doctoral Student (SRF) ICAR- Central Institute of Coldwater Fisheries Research, Bhimtal Mobile No.: +91 9536940943 On Sat, 22 Nov 2025 at 21:22, Alexandra Zahradnikova <alexandra.zahradnikova@savba.sk> wrote: Dear Vinita, You have to input the MODELLER password into the ChimeraX interface before starting the program. You will get the password by e-mail when you register with the Modeller web-page. Best Sasha From: Vinita Pant via ChimeraX-users [mailto:chimerax-users@cgl.ucsf.edu] Sent: Saturday, November 22, 2025 15:43 To: ChimeraX Users Help Subject: [chimerax-users] Re: Problem with modeller execution location Dear Elaine, I also tried reinstalling Modeller. But the problem persists. I have attached the image showing the error. Is there a way to manually fix this in Chimera? Thanks and Regards Vinita Pant Doctoral Student (SRF) ICAR- Central Institute of Coldwater Fisheries Research, Bhimtal Mobile No.: +91 9536940943 On Tue, 18 Nov 2025 at 22:41, Vinita Pant <vinipant78@gmail.com> wrote: Thank you for the clarification. Thanks and Regards Vinita Pant Doctoral Student (SRF) ICAR- Central Institute of Coldwater Fisheries Research, Bhimtal Mobile No.: +91 9536940943 On Tue, 18 Nov 2025, 10:39 pm Elaine Meng, <meng@cgl.ucsf.edu> wrote: The errror message is not about the path/location. It is about the license key, which you have to enter into the dialog directly. Please read the help:
https://rbvi.ucsf.edu/chimerax/docs/user/tools/modelloops.html#key
If you can't find the key in your local installation just follow the instructions/links in the above to get another key from the Modeller developers. Elaine
On Nov 18, 2025, at 8:59 AM, Vinita Pant via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
Thank you for the information. Yes I have been using the academic version of Modeller directly. I tried locating the modeller path inside chimera. It still didn't work.
Thanks and Regards Vinita Pant Doctoral Student (SRF) ICAR- Central Institute of Coldwater Fisheries Research, Bhimtal Mobile No.: +91 9536940943
On Tue, 18 Nov 2025, 10:26 pm Elaine Meng, <meng@cgl.ucsf.edu> wrote: Hi Vinita, This error message is not about the location. As it says in the message, you have to get a license key for Modeller, which is obtained from the Modeller developers.
This is all explained in the documentation, e.g. shown by clicking the Help button on the Model Loops dialog. See requirement #3 in the documentation: <https://rbvi.ucsf.edu/chimerax/docs/user/tools/modelloops.html#key>
You would need to enter that license key into the tool as described. When you say "successfully using Modeller for homology modeling" I don't know if you meant from inside ChimeraX, or just using Modeller directly. If you were doing it from inside ChimeraX, you should have already gotten this license key and entered it into the ChimeraX dialog. If you were doing it directly with Modeller installed on your own computer, I don't know where the license key is kept. Probably somewhere in the Modeller installation.
I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Resource for Biocomputing, Visualization, and Informatics Department of Pharmaceutical Chemistry University of California, San Francisco
On Nov 17, 2025, at 11:04 PM, Vinita Pant via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
Dear ChimeraX Team, I am using ChimeraX (version: 1.10.1 (2025-07-24)) for filling missing residues, for which Chimera uses Modeller in the background. However, I've encountered an issue regarding the executable location of Modeller. Although I am successfully using Modeller for homology modeling, I am receiving a notification in ChimeraX stating that the license key is unavailable. I have attached an image of the error message for your reference. I would appreciate your guidance in resolving this matter.
Thanks and Regards Vinita Pant Doctoral Student (SRF) ICAR- Central Institute of Coldwater Fisheries Research, Bhimtal Mobile No.: +91 9536940943
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