enum error reported by the Keil compiler in SDK examples

In the template project one gets an error using the Keil compiler in gap.h here

/// Random Address type

enum gap_rnd_addr_type
{
/// Static random address
GAP_STATIC_ADDR = SMPM_ADDR_TYPE_STATIC,
/// Private non resolvable address
GAP_NON_RSLV_ADDR = SMPM_ADDR_TYPE_PRIV_NON_RESOLV,
/// Private resolvable address
GAP_RSLV_ADDR = SMPM_ADDR_TYPE_PRIV_RESOLV,
};

THis is a case where an enum is being delcared by another enum defined in smpm.h which is

/**
* Random Address Types
*/
enum smpm_rand_addr_type
{
/// Private Non Resolvable - 00 (MSB->LSB)
SMPM_ADDR_TYPE_PRIV_NON_RESOLV = 0 x00,
/// Private Resolvable - 01
SMPM_ADDR_TYPE_PRIV_RESOLV = 0x40,
/// Static - 11
SMPM_ADDR_TYPE_STATIC = 0xC0,
};

There error reported by the compiler is that the values in gap.h for the gap_rnd_addr_type enum are undefined. THis nested use of enums appears weird. Why is this happening and what can I do to resolve it. (Note this is not code I have written but was done by DS and/or RW. Thanks for a resolution.

Oh yes, the smpm.h header is included in the gap.h header.