objective c - colorRadialShading: nil value for argument -

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i'm creating painting app on cimicropaint sample code. , right i'm getting error /sourcecache/coreimage/coreimage-8.4.0/api/cifilter.mm:588: ciradialgradient apply:: caught exception: ciradialgradient: colorradialshading: nil value argument #2 (c0) when try draw on cimicropaintview 1 can explain error why i'm getting ? error mean view don't color draw with?


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