[mkgmap-dev] "could not open style null…" with r3740 and r3734

Hi, I suddenly got an issue with r3740 and the the problem exists too with r3734 but not with r3676. This happened suddenly and I could not determine a wrong manipulation on my part. r3740 and r3734 produce the message: "Found one style in /home/steph/osm/styles/default/ could not open style null in /home/steph/osm/styles/default/ finished check-styles" With r3676, no problem: "Found one style in /home/steph/osm/styles/default/ finished check-styles" $ java -version openjdk version "1.8.0_111" OpenJDK Runtime Environment (build 1.8.0_111-8u111-b14-2ubuntu0.16.04.2-b14) OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode) An idea ? More information needed ? Best regards. Steph