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No error.
OS_ERR_OBJ_PTR_NULL
if If OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if p_grp is a NULL pointer.
OS_ERR_OBJ_TYPE
if If OS_CFG_OBJ_TYPE_CHK_EN is set to 1 in os_cfg.h: p_grp is not pointing to an event flag group.
OS_ERR_OPT_INVALID
if If OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: the caller specified an invalid option.
...
the wait on the flags was aborted by another task that called OSFlagPendAbort().
OS_ERR_PEND_ISR
if If OS_CFG_CALLED_FROM_ISR_CHK_EN set to 1 in os_cfg.h: An attempt was made to call OSFlagPend() from an ISR, which is not allowed.
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