Exceptions may be:

1) Schema compilation   - schema syntax or other exceptions;
                          project execution terminates;
2) Source Text          - three levels of severity:

                            0. programmer can raise an exception in schema:
                               +message.exc
                            1. certain conditions can trigger event
                               message.exc
                               which is usually considered as syntax exception 
                               in sourece text;  precisely:
                                  eot met 10 times uncaught in schema,
                                  unrecognized event;
                            2. due exceptions, source text/file conversion is terminated, but
                               project processing continues;
                            3. projects are stopped;

3) Script2Script own    -   terminates or recommends to terminate S2S or
                            run-time error.
                          This is a bug and should never happen.
                          If happened, you may contact vendor.

Exception message in given file may be quickly found
if to make a search by file-name in file console.txt.