Error ‘BluesamManager’ when starting modernized application in AWS Mainframe Modernization

When starting the CardDemo application in AWS Mainframe Modernization, I get the following stack trace:

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netfective.bluage.gapwalk.bluesam.BluesamManager]: Factory method 'bluesamManager' threw exception; 
nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bluesamLocksManager' defined in class path resource [com/netfective/bluage/bluesam/autoconfigure/BluesamAutoConfiguration$EmbeddedBluesamAutoConfiguration.class]: Bean instantiation via factory method failed; 
nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netfective.bluage.gapwalk.bluesam.concurrent.locks.BluesamLocksManager]: Factory method 'bluesamLocksManager' threw exception; 
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.netfective.bluage.bluesam.autoconfigure.BluesamAutoConfiguration$RedisBluesamLocksAutoConfiguration': Unsatisfied dependency expressed through field 'redisLocker'; 
nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisBluesamLocker': Invocation of init method failed; 
nested exception is org.springframework.data.redis.RedisConnectionFailureException: java.net.SocketTimeoutException: Read timed out; 
nested exception is redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: Read timed out

I tried to stop / restart the application and to recreate, but to no avail.