OPAM故障:外部解算器故障

尝试在Arch Linux 4.12.10上使用OCaml进行开发时,我不断遇到以下错误消息:

### stderr ###
# error: executing gringo failed (No such file or directory)
# error: gringo returned with non-zero exit status

[ERROR] External solver failure, please fix your installation and check /home/me/.opam/config and variable $OPAMEXTERNALSOLVER.
        You may also retry with option --use-internal-solver

• opam init
• opam install ocamlfind
• opam switch 4.02.3+buckle-master

事实上,正如错误消息所说,附加 --use-internal-solver 使命令成功运行。

我的OPAM版本是1.2.2。