Slim Error while running fitnesse unable to connect with Appian

Hello,

We have tried to connect Appian URL in fitnesse , however could not complete testing due to slim error. Kindly help us to resolve the issue and guide us to proceed with Appian connectivity.

Also, please let us know if Java version 17 and above will work for fitnesse, appian connectivity. Since there is mentioned java 11 only supported in fitnesse page.

We are stuck in project activity due to above issue and unable to proceed. Urgent help is appreciated.

Error Message

Could not complete testing: fitnesse.slim.SlimError: Error SLiM server died before Header Message could be read. Unable to start test system 'slim': fitnesse.slim.SlimError: Error SLiM server died before Header Message could be read.