error :"__use_no_semihosting_swi was requested"

hi
i have a problem .i'm using rl http demo sample and it works fine.
But when i enable ftp in network config this error appears :

.\Obj\Http_demo.axf: Error: L6915E: Library reports error: __use_no_semihosting_swi was requested, but a semihosting fgetc was linked in

what does it mean ? and what caused it ?

thanks for any answer

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