For static LDP bindings to work, you also need static routes in routing table:
[admin@p3_450] /mpls local-bindings> print
Flags: X - disabled, A - advertised, D - dynamic,
L - local-route, G - gateway-route, e - egress
# DST-ADDRESS LABEL PEERS
0 G 10.255.0.0/24 1000
1 G 10.255.1.0/24 1113
[admin@p3_450] /mpls local-bindings> .. remote-bindings print
Flags: X - disabled, A - active, D - dynamic
# DST-ADDRESS NEXTHOP LABEL PEER
0 A 10.255.1.0/24 10.155.125.1 1111
[admin@p3_450] /ip route> print
Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit
# DST-ADDRESS PREF-SRC GATEWAY DISTANCE
1 ADC 10.155.125.0/24 10.155.125.18 ether1 0
2 A S 10.255.0.0/24 10.155.125.1 1
3 A S 10.255.1.0/24 10.155.125.1 1
[admin@p3_450] /mpls forwarding-table> print
Flags: H - hw-offload, L - ldp, V - vpls, T - traffic-eng
# IN-LABEL OUT-LABELS DESTINATION IN NEXTHOP
0 expl-null
1 L 1000 10.255.0.0/24 et 10.155.125.1
2 L 1113 1111 10.255.1.0/24 et 10.155.125.1