/usr/bin/python: No module named virtualenvwrapper

When I open the terminal, it will always show the following error message:

If Python could not import the module virtualenvwrapper.hook_loader,
check that virtualenvwrapper has been installed for
VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is
set properly.
-bash: declare: -A: invalid option
declare: usage: declare [-afFirtx] [-p] [name[=value] ...]
-bash: complete: -D: invalid option
complete: usage: complete [-abcdefgjksuv] [-pr] [-o option] [-A action] [-G globpat] [-W wordlist] [-P prefix] [-S suffix] [-X filterpat] [-F function] [-C command] [name ...]
-bash: /Users/zjh/.venvburrito/bin/virtualenvwrapper.sh: No such file or directory
/usr/bin/python: No module named virtualenvwrapper
virtualenvwrapper.sh: There was a problem running the initialization hooks.

The post on StackOverflow doesn't help. Could you please help me solve this problem? Thanks!