IOException: com.inductiveautomation.ignition.client.gateway_interface.GatewayException: Java heap space
caused by GatewayException: Java heap space
caused by OutOfMemoryError: Java heap space
You re running into an out of memory error in the designer, try increasing the maximum memory for a designer session (gateway setting) and try again. Default I believe is 1024, try 2048 or 4096