Pseudowire no FEC Mapping result?

Hi,

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We have VC which is remote address is from ASBR(option c), Why I'm getting this "No FEC mapping" result when ping the pseudowire circuit while the VC itself is up?

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I'm not able to ping the remote IP using ping MPLS feature.

ping mpls ipv4 xxxx/y source xxxx

.....

Success rate is 0 percent (0/5)

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ping mpls pseudowire xxxxx 100 source xxxx

Type escape sequence to abort.

FFFFF

Success rate is 0 percent (0/5)

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Trace MPLS from Source to remote VC

TRACE 1:

0 x.x.x.x MRU 9202 [Labels: 27626 Exp: 0]

L 1 x.x.x.x MRU 9180 [Labels: 24006 Exp: 0] 5 ms

L 2 x.x.x.x MRU 9202 [Labels: 57 Exp: 0] 9 ms

L 3 x.x.x.x MRU 9216 [Labels: 576580 Exp: 0] 9 ms

L 4 x.x.x.x MRU 4484 [Labels: 625970 Exp: 7] 49 ms

D 5 x.x.x.x MRU 0 [No Label] 29 ms <<<------- DS Map mismatch

TRACE 2:

0 x.x.x.x MRU 9202 [Labels: 27626 Exp: 0]

L 1 x.x.x.x MRU 9180 [Labels: 24006 Exp: 0] 2 ms

L 2 x.x.x.x MRU 9202 [Labels: 57 Exp: 0] 9 ms

L 3 x.x.x.x MRU 9216 [Labels: 576580 Exp: 0] 9 ms

L 4 x.x.x.x MRU 4484 [Labels: 625970 Exp: 7] 51 ms

L 5 x.x.x.x MRU 4484 [Labels: implicit-null Exp: 0] 54 ms

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but when pinging using normal IPv4 I can reach the destination IP?

ping ipv4 xxxx source xxxx

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 36/36/37 ms

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Any idea? is this because theres a break on LSP path?

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Thanks

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