Error message with print string

As stated in the tittle I keep getting an error that goes as “Accessed None ‘K2Node_dynamicCast_AsArena_GI’ From node Print string in graph ‘EventGraph’ in bluepint Voidless 12”. What im trying to do is dispay the location of an AI character in the game using the print string so that I can debug it.

Also for some reason it keeps stating "This map is using externally referenced packages which won’t be found when in a game and all references will be broken. Perform a map check for more details.

Would you like to continue?"

rename the project folder
launch project
close project
rename back

Thank you sir I shall try that tonight