Page Script Debug Errors: if our application scripting language is vb script ,in some browsers if doesnt supports the langualge then it throws the exception.
Session Time out Error: If the page load requested session time is 10sec and the page doesnt load in 10 sec then it throws the session time out error.
Unhandled Exceptions:if there are exception handlers not mentioned in code then the unhandled exceptions will occur.
Activex control error: If the application has activex controls and no activex control software dll'sn is not loaded in the browseer then it throws this exception.
if any more lemme know...........of it................