error: conflicting declaration 'int SCK'

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hi

i'm trying use sample code controlling emartee 16x16 led matrix
http://www.emartee.com/product/41903/wrobot-16*16-dot-matrix-led-shield
but when attempt verify following error comes up

sketch_may13a:79: error: conflicting declaration 'int sck'
/applications/arduino.app/contents/resources/java/hardware/arduino/variants/standard/pins_arduino.h:43: error: 'sck' has previous declaration 'const uint8_t sck'

it seems using sck twice not sure how fix this

?any suggestions

chris

"sck" standard name spi serial clock pin (pin 13).  should choose different name variable.


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