When running with run_e3sm script, popped up error message 'unable to access bitbucket....'

I am tring to run E3SM and got the code through below command.

**git clone -b maint-2.0 --recursive https://github.com/E3SM-Project/E3SM.git**

and then, I only edited **MACHINE=cori-knl** to **MACHINE=default** in run_e3sm.template.sh script.

When I run the script and after about 5 mins, an error message popped up.

**Cloning into 'components/mpas-ocean/src/SHTNS'...
fatal: unable to access 'https://bitbucket.org/nschaeff/shtns.git/': Peer's certificate issuer has been marked as not trusted by the user.
Clone of 'https://bitbucket.org/nschaeff/shtns.git' into submodule path 'components/mpas-ocean/src/SHTNS' failed**

How can I solve this problem..?
please I need your help.

Read run_e3sm.template.sh and inspect the recursive submodule setup for components/mpas-ocean/src/SHTNS. Reproduce the run after changing MACHINE=default, then determine whether the failure is in the repository’s submodule configuration or the local Git certificate trust. Done means the SHTNS submodule clones successfully and the script proceeds.

Written by the indexing model from the issue text.