'VectorFloat16' was not declared in this scope

Hello, trying to compile the sketch I get the following error:

main:133:9: error: 'VectorFloat16' was not declared in this scope

     VectorFloat16 down;

     ^

main:134:28: error: 'down' was not declared in this scope

     mpu.dmpGetGravity(&down, &q);

                        ^

exit status 1 'VectorFloat16' was not declared in this scope

How can I correct it?

Thanks, regards