stm下载问题

大侠们，请指教，我用的板子CPU是STM32F103RCT6,我在用JFlashARM写入是出现错误提示：Could not find supported CPU core on JTAG chain
Bad JTAG communication:Write to IR:Expected 0X1,got 0x0 Failed to connect
请问该如何处理。