KB10284 - When I am debugging an exception occurs. What is wrong?

Probably nothing is wrong, so you can just ignore the exception and continue the execution.

The DK uses both the system and its own exceptions to track situations that are not necessarily abnormal. For example, to check if a provided string is a float number, the DK tries to convert the string to a float, which can raise exception. Similarly, to check if a provided symbol file can be treated as a picture, the DK tries to open it as a picture. We are using exceptions to discover which symbols are not valid picture formats. The reason is fairly simple: DK users can add a lot of their own formats to TPicture, and we have no other way to test if a format is supported by TPicture than by just trying to open it.

If you dislike this, you can turn off a specific exception class in the Tool/Debugger Options dialog box.