In the Tanto Monta 4.1 module, I moved a piece (N. African boat) from the "Removed Pieces" tray to the "Forces" tray.
Tanto Monta (Carlos Diaz / Ivan Caceres) v4.1 3.7.7
java.lang.StackOverflowError: null
at bsh.Parser.jj_3_9(Parser.java:4994)
at bsh.Parser.jj_2_9(Parser.java:3755)
at bsh.Parser.UnaryExpressionNotPlusMinus(Parser.java:1897)
at bsh.Parser.UnaryExpression(Parser.java:1813)