Bungeecord error

When I start up my server this is the error i get

er.java:155)

02:39:03 [SEVERE] at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:233)

02:39:03 [SEVERE] at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:155)

02:39:03 [SEVERE] at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:233)

02:39:03 [SEVERE] at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:155)

02:39:03 [SEVERE] at...

Bungeecord error