Duplicate atom by copy/paste

When I tried to duplicate atoms by copy/paste , I get ''ERROR reading CJSON file ‘’ warning. Can you help me , plase?

It would help to know more about your problem:

  • What version of Avogadro are you using?
  • What OS are you using?
  • Have you tried a nightly build from https://two.avogadro.cc/ to see if that helps your problem?

You posted in the Development topic, but this seems better suited to Support discussion.

firstly, thank you very much …
– I am using Avogadro 1.99.0
– using Microsoft 11
– yes I tried, but didin’t help me…