Plugin problem? Bedwars?

I installed the plugin bedwarsrel on my minecraft server. However, if I now want to mark the bed comes a problem. Can anyone tell me where the problem is and how can I fix it? Version is 1.15.2

Mc Chat:

confiq:

I'm grateful for every answer

Error message?

Well only what is in the mc chat

Others also have problems with newer versions of Minecraft. The plugin is simply out of date.

Have you tried specifying the "Bed Block" yet?

Since you have a red bed, "red_bed" accordingly.