'ECANCELED' was not declared in this scope line 128, external location: c:\program files (x86)\atollic\truestudio for stm32 9.3.0\armtools\arm-atollic-eabi\include\c++\6.3.1\arm-atollic-eabi\armv7e-m\fpu\fpv5-d16\bits\error_constants.h

[madhavi U]

why am i getting this error and how to solve it?

[Pavel A.]

> why am i getting this error

There is a deficient errno.h file somewhere on your include path

> and how to solve it?

Reorder include paths so that a good errno.h is found before the bad one.

[Tesla DeLorean]

The compiler tells you where to look, perhaps start there, and unravel the context..

Probably some conflicting #define on your end.

Have the compiler generate pre-processor output, and review that.