[ns] Error in IEEE 802.11 implementation

Hello everyone,

In my implementation of an ad hoc network where 10 nodes communicate with a
central hub, I get the following error and implementation does not
terminate.
*

MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 0, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 1, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 2, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 3, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 4, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 5, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 6, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 7, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 8, size
10)!*
*MAC_802_11: accessing MAC cache_ array out of range (src 10, dst 8, size
10)!*
*[suppressing additional MAC cache_ warnings]*

What does this mean? And how can I rectify it?

Thank you.

Regards,
Abinaya Ulagappa