ERROR: Please set the 'PERSISTENT_DIR' or 'CACHE' variable. using bitbake on openembedded

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If you want to build for angstrom you should be following http://www.angstrom-distribution.org/building-angstrom

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Hello,
       I am following same steps mention on that link:
When I run bitbake base-image command, I got following error:
ERROR: IO Error: [Errno 13] Permission denied: '/OE/angstrom-dev/
saved_tmpdir'