Ambari fails with strange error while deploying configuration from blueprint

[#1]

Dear community,

Trying to deploy a cluster via blueprint, but obtain a wierd error:

ERROR [ambari-client-thread-24] QueryParser:115 - Lowercase host_name value in expression failed with error:java.lang.NullPointerException

Had not found this error anywhere in documentation so trying to ask here.

[#2 · Accepted solution]

Seems the problem was with nodes specified in cluster configuration. They were not correctly provisioned. However the error looks wierd.

[#3]

double check the values you entered in the host_name field, do you have a space there maybe?

This is what it suppose to look like, for anything else paste your blueprint

"blueprint" : "multi-node-hdfs-yarn",
    "host_group" : "slaves",
    "host_name" : "c6404.ambari.apache.org"

[#4]

@Vladislav Falfushinsky

Can you attach your blueprint json file?