Why am I getting the app error 523?

I performed a reboot on my BB this morning when I couldn't access my email contacts. I had about a 50% battery charge. I then received a app error 523 message after searching online I used the app loader wizard to try and eliminate the error message. I only have 7-8 apps loaded and none needed any action. I clicked next and finish and got a white screen on my phone and then nothing. I11 then repeated the App Loader wizard this time running in administrator mode and still the sameresults. Any advice would be appreciated thank you

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