运行Teaspoon时出现“无效标识符”错误

Question

运行茶匙时，我遇到以下错误：

rake teaspoon
Starting the Teaspoon server...
Teaspoon running default suite at http://127.0.0.1:64790/teaspoon/default
sh: line 25: `BASH_FUNC_set_shell_label%%': not a valid identifier

Teaspoon running insight suite at http://127.0.0.1:64790/teaspoon/insight
sh: line 25: `BASH_FUNC_set_shell_label%%': not a valid identifier

Teaspoon running wb5 suite at http://127.0.0.1:64790/teaspoon/wb5
sh: line 25: `BASH_FUNC_set_shell_label%%': not a valid identifier

我还没有能够确定哪个文件的第25行是问题。