Appian Integration with external KAFKA

We are following the same link ( community.appian.com/.../kafka-tools) to set up the connectivity with KAFKA.
We installed KAFKA in the windows system and in same system, Appian is installed.
We're trying to connect to KAFKA without SSL/ SASL_SSL.

Following are the configuration details we have specified in the data section of configure publish to KAFKA smart service.

Secure Credentials Store Key: "kafkacredstore"
Servers: "localhost:9095"
Topic: "DETestTopic"
Payload: "===========Test Payload=============="
Security Protocol: "PLAINTEXT"
SASL Mechanism: TrustStore:
KeyStore:

Attached screenshots:
1- Third-Party Credentials configuration

2- KAFKA server.properties

we are getting below error. Problem: An error occurred in executing an Activity Class.
Details: [Invalid sasl mechanism] Recommended Action: Examine the activity class to correct the error and then resume.
Priority of this problem: High Priority