Since several days ago I have been unable to use pacopts with aur. All aur operations yield errors like:
error: [glc-player]: query failed: Invalid version specified.
I don't know if there is a problem with my system, with the tool, or upstream.. any help is much appreciated.
Can please you provide the complete output and the command launched?
These are the commands and the output: 
--- ~ » pacopts -v4 aur -U
error: [nvm]: query failed: Invalid version specified.
error: [glc-player]: query failed: Invalid version specified.
error: [neovim-plug]: query failed: Invalid version specified.
error: [libopenaptx]: query failed: Invalid version specified.
error: [glc-lib]: query failed: Invalid version specified.
error: [opencolorio1]: query failed: Invalid version specified.
error: [qt4]: query failed: Invalid version specified.
error: [vscodium]: query failed: Invalid version specified.
pacopts: info: nothing to do
--- ~ » pacopts -v4 aur -i glc-player
pacopts: info: get information for glc-player
:: [glc-player]: query failed: Invalid version specified.
:: no results found
--- ~ » pacopts -v4 aur -s glc-player
pacopts: info: search glc-player
:: [glc-player]: query failed: Invalid version specified.
Recently, there's a rpc interface change from AUR server side. It impacts all AUR helpers. "cower" is one of them. Should be updated soon.
Thanks for the information. I'll continue waiting a bit for the issue to be resolved then, as it doesn't appear to be my system.
sync and update cower. It now should be ok.
Many thanks for your report and your patience. It's really appreciated.

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