diff --git a/slides/09-Error-Handling.pdf b/slides/09-Error-Handling.pdf old mode 100755 new mode 100644 index c3d2074..1a2f29a Binary files a/slides/09-Error-Handling.pdf and b/slides/09-Error-Handling.pdf differ diff --git a/slides/9-Error-Handling.pdf b/slides/9-Error-Handling.pdf deleted file mode 100644 index 1a2f29a..0000000 Binary files a/slides/9-Error-Handling.pdf and /dev/null differ