Problems with the project STM32L476G-Discovery Demonstration

I try to create a project from directory (STM32Cube_FW_L4_V1.14.0\Projects\32L476GDISCOVERY\Demonstrations\TrueSTUDIO). It creates two projects: "TrueSTUDIO" and "STM32L476G-Discovery" . The file TrueSTUDIO_converter.log is generated in the folder TrueSTUDIO. It says:

Project: TrueSTUDIO

Converter: IARProjectParser

Date: 20190627

Failed to parse IAR project format file, if possible please send the Project.ewp file together with the workspace log file to Atollic support.

When I try to build the project "STM32L476G-Discovery" an error occures:

...

In file included from ..\..\..\Core\Src\main.c:34:0:

../../../Modules/guitartuner/guitartuner.h:33:22: fatal error: arm_math.h: No such file or directory

 #include "arm_math.h"

           ^

compilation terminated.

21:24:44 Build Finished (took 39s.82ms)

Could anybody help me?