#define LOS_ERRNO_SWTMR_NO_MEMORY   LOS_ERRNO_OS_ERROR(LOS_MOD_SWTMR, 0x07)

Software timer error code: Insufficient memory for software timer linked list creation.

Value: 0x02000307

Solution: Allocate bigger memory partition to software timer linked list creation.

在文件los_swtmr.h130行定义。