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TIDA-01012: about the read error sysbol "X"

Part Number: TIDA-01012
Other Parts Discussed in Thread: CC2640, BLE-STACK

Dear TI expert,

i am learning the TIDA-01012, when i rebuild project, the build finished, no error. but the TOOLS folder has a red "X" symbol, the picture as follows:

Can you help me?

have a nice day!