Pandora download problem

[C Phillips]

I recently switched from another Samsung Galaxy phone to this Samsung Galaxy S3 Mini. I had Pandora on my other phone, but apparently it didn't transfer over when Verizon made the switch to the new Mini for me. When I tried to download it again, a circle icon just spins and spins, and then an error code appears -- Error 5003. I cannot proceed. Suggestions welcome, and thanks.