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About BL51 and LX51 in Keil

I have a problem by using Keil.The error message is here:*** FATAL ERROR L214: INPUT PHASE ERROR
I have seen uVision help , but i still can not understand this error.
Does anyone konw it? Thanks for helping me.

When I change BL51 to LX51, there is no error.But the program can not run normally.