My FTB launcher doesn't launch any mod packs

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Darth_Joey

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Jul 29, 2019
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  1. I keep getting this error, and FTB just pops up with a blank screen.
    [10:28:25] [ERROR] DatatypeConverter.parseBase64Binary:-1->MinecraftLauncher.main:217: Unhandled error launching minecraft: java.lang.NullPointerException
    i don't know what this error means please help.
 
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