# An Item With The Same Key Has Been Added Problem **URL:** \ **Category:** Bug Reports\ **Created:** [June 17, 2026, 5:05pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539 "2026-06-17T17:05:55Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![tuunch](https://avatars.discourse-cdn.com/v4/letter/t/34f0e0/32.png) [@tuunch](https://prepomax.discourse.group/u/tuunch)\ **Post date:** [June 17, 2026, 5:05pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/1 "2026-06-17T17:05:55Z")
Hello, I’ve been trying to do a strength analysis. It went well even though I had pretty dense mesh, a lot of rigid bodies etc. . But after I added distributed mass and gravity load even though it converges and solves the analysis with no errors, whenever I try to open the results it gives me this error. I tried saving the file differently, changing the analysis name, ran it again and it still is the same. I found an older post about this but recommendations did not work for me. I would be so glad if someone can help me. Here is the file if you are interested: [https://drive.google.com/file/d/17KjPTqdbSxl5Dgl6sNOk\_oD0JWg8uAwm/view?usp=sharing](https://drive.google.com/file/d/17KjPTqdbSxl5Dgl6sNOk_oD0JWg8uAwm/view?usp=sharing) ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/9/99434c5bf742a5eaf9ac8b3f232a5c25e1b52b34.png) ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [June 17, 2026, 5:22pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/2 "2026-06-17T17:22:03Z")
I can confirm it, also in v2.5.1. However, I can open the .frd file in CalculiX GraphiX, so it’s not corrupted. Regarding the analysis setup, it’s much better now, but we are still discussing the possible improvements (e.g. the way anchors are modeled). There should be a separate Gravity load for mass section too. ---
**Author:** ![tuunch](https://avatars.discourse-cdn.com/v4/letter/t/34f0e0/32.png) [@tuunch](https://prepomax.discourse.group/u/tuunch)\ **Post date:** [June 17, 2026, 5:26pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/3 "2026-06-17T17:26:47Z")
Thanks for the feedback. So what should I do to bypass/fix this error message? I can not even open my previous analysis results even when I restart the computer, trying to open the frd file from temp folder etc. . It kinda affected everything. ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [June 17, 2026, 5:29pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/4 "2026-06-17T17:29:41Z")
Are you using v2.5.0 or v2.5.1 ? Try with a different version, in a different folder (including temporary directory), with a new analysis name, and so on. Opening with the approach explained here (point 5) should still work: [Using standalone CalculiX](https://prepomax.discourse.group/t/using-standalone-calculix/846) ---
**Author:** ![tuunch](https://avatars.discourse-cdn.com/v4/letter/t/34f0e0/32.png) [@tuunch](https://prepomax.discourse.group/u/tuunch)\ **Post date:** [June 17, 2026, 5:34pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/5 "2026-06-17T17:34:14Z")
I’m using v2.5.0 at the moment. Should I do extra stuff to be able to run the v2.5.1 because according to my knowledge it still is in development. ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [June 17, 2026, 5:38pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/6 "2026-06-17T17:38:50Z")
No, v2.5.1 is a dev (not stable) version, but installation is the same - just unpack it in a folder where admin rights are not needed. ---
**Author:** ![tuunch](https://avatars.discourse-cdn.com/v4/letter/t/34f0e0/32.png) [@tuunch](https://prepomax.discourse.group/u/tuunch)\ **Post date:** [June 17, 2026, 5:47pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/7 "2026-06-17T17:47:45Z")
The approach you linked is downloading the GraphiX, right? ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [June 17, 2026, 5:50pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/8 "2026-06-17T17:50:02Z")
Yes, from here: [https://www.dhondt.de/](https://www.dhondt.de/) You can also try converting to ParaView format since ParaView is more convenient for postprocessing: [Converting results to ParaView format](https://prepomax.discourse.group/t/converting-results-to-paraview-format/453) ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [June 17, 2026, 5:52pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/9 "2026-06-17T17:52:23Z")
Does this model run and open properly for you ? [yeni\_final\_mod.pmx](https://prepomax.discourse.group/uploads/short-url/jQ1CrLZxMYQqQ8c1bIOntVGLDAb.pmx) (4.7 MB) ---
**Author:** ![tuunch](https://avatars.discourse-cdn.com/v4/letter/t/34f0e0/32.png) [@tuunch](https://prepomax.discourse.group/u/tuunch)\ **Post date:** [June 17, 2026, 5:55pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/10 "2026-06-17T17:55:28Z")
Unfortunately I can not see results in this either. Same error message. The analysis I ran probably affected the previous and future analysis results at the moment. By the way, I followed the instructions in the topic you linked and when I try to run the command ccx\_static file\_name even with admin or not I get “ccx\_static’ is not recognized as an internal or external command, operable program or batch file.” message. ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [June 17, 2026, 5:57pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/11 "2026-06-17T17:57:03Z")
You don’t have to use ccx\_static if you already have the .frd file from PrePoMax run. Just skip to the cgx\_glut command. But make sure that the CalculiX binaries are in the same folder as the .frd file or added to Windows PATH (points 2 and 3 in the linked thread about standalone CalculiX). ---
**Author:** ![tuunch](https://avatars.discourse-cdn.com/v4/letter/t/34f0e0/32.png) [@tuunch](https://prepomax.discourse.group/u/tuunch)\ **Post date:** [June 17, 2026, 6:07pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/12 "2026-06-17T18:07:22Z")
I moved my .frd file to the calculix\_2.23\_4win and ran the cmd in admin with the prompt of “cgx\_GLUX yeni\_final.frd” but i got the same previous message. Also, I’m not that knowledgable this kind of stuff. I don’t understand what do you mean by “make sure that the CalculiX binaries are in the same folder as the .frd file or added to Windows PATH” ---
**Author:** ![tuunch](https://avatars.discourse-cdn.com/v4/letter/t/34f0e0/32.png) [@tuunch](https://prepomax.discourse.group/u/tuunch)\ **Post date:** [June 17, 2026, 6:11pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/13 "2026-06-17T18:11:50Z")
I figured it out, I will do my best to get the results right now. If possible I would like to contact again, if something happens again. Thanks for the help. ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [June 17, 2026, 6:14pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/14 "2026-06-17T18:14:27Z")
Yeah, you can do it like this: ![yeni_final_frd](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/3/3f4bf3b0a72534c13da51b911f40f970f1d0ecae.jpeg) There’s still a bug to solve here, but let’s discuss the rest (analysis setup) separately. Hit me up anytime. ---
**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\ **Post date:** [June 18, 2026, 8:47am UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/15 "2026-06-18T08:47:48Z")
The problem is the distributed mass. It creates nodal masses in the background for each node, and so for each mass, a material is output to the .frd file. The problem is that all materials have the same name, so they cannot be stored in the same dictionary. I have fixed the problem, and the solution will be part of the new PrePoMax version. ---
**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\ **Post date:** [July 7, 2026, 9:08am UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/16 "2026-07-07T09:08:29Z")
Please check the new functionality and confirm if I can close the bug report. ---
**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\ **Post date:** [August 7, 2026, 1:57pm UTC](https://prepomax.discourse.group/t/an-item-with-the-same-key-has-been-added-problem/3539/17 "2026-08-07T13:57:06Z")
Closed on August 7, 2026, 1:57pm UTC