HI. I followed the instruction of part 2.1.1 in document "zedboard_CTT_v2013_2_130807" to build a simple new embedded project on zynq processing system, but I came across two problems. 1. the instruction does not contain detailes for system.xdc. 2. I cannot export my design to SDK, it turned out that "Unable to create Hardware Specification Project with specification file: F:/Users/cccc/Documents/生产实习/embedded_system/embedded_system.sdk/SDK/SDK_Export/hw/system.xml ". Can anyone help me?