I tried to evaluate PacletUpdate["CloudObject"] in WolframKernel.exe, but got the error:

PacletInstall::dwnld: An error occurred downloading paclet CloudObject-10.3.760 from site http://pacletserver.wolfram.com: File not found on server.

I changed my default setting for the printer, but doesn't work either.

What should I do now ?

  • $\begingroup$ Can you try unplugging your internet cable, launching Mathematica, plugging in the cable and executing the PacletUpdate[...] command. $\endgroup$ – Sektor Sep 8 '15 at 19:19
  • $\begingroup$ I'm also having this problem. After unplugging internet cable Mathematica still doesn't initialize and won't launch. $\endgroup$ – Jesse Sep 8 '15 at 19:20
  • $\begingroup$ It doesn't work. I just remove "pacletData_10.0.0.0_7270004994179419278.pmd2" and "pacletSiteData_10.pmd2" and then Mathematica initialize successfully. Those two files then appear again. Looks like I have to remove them again and again before I want to start Mathematica. $\endgroup$ – Jianbo Luo Sep 8 '15 at 19:25
  • 2
    $\begingroup$ I think this error is because the broken paclet has just been removed from the server. Try evaluating PacletSiteUpdate /@ PacletSites[] first. $\endgroup$ – ilian Sep 8 '15 at 19:29
  • $\begingroup$ @ilian You should post this as an answer not a comment. It worked for me. $\endgroup$ – Jesse Sep 8 '15 at 19:31

The error is due to the issue being fixed on the server, which involves removing the CloudObject-10.3.760 paclet so it is no longer downloadable.

Evaluate first

PacletSiteUpdate /@ PacletSites[]

and then


I have also updated the original answer to include this step.


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