# What to do when things go wrong The PyCdlib library can fail for a number of reasons. The most common reason for an unexpected failure is when an ISO file doesn't follow the relevant standards. In these cases, PyCdlib will usually throw a `PyCdlibInvalidISO` exception (though it can also throw a `PyCdlibInternalError` in some circumstances). If this happens, the absolute best thing to do is to open up a new [issue](https://github.com/clalancette/pycdlib/issues), putting a pointer to the problematic ISO in the issue. If the ISO file cannot be shared, then a new issue should be created anyway, with the relevant backtrace from PyCdlib in it. From there, additional information can sometimes help to identify the root cause of the issue. ---
<-- Exceptions
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