A little more info might be helpful.
Like - what browser (and version number)? What version of TestComplete? what is on the page at the point it crashes? What operation/action are you trying to perform at the time (or have just performed)? What is throwing the error? (TestComplete? the browser? something else?)
Nowhere near enough info there to give you any sort of sensible answer.
A quick google of the error brings up this page:
https://community.oracle.com/thread/1043349?tstart=0... about a similar problem when using Oracle Forms. In which case you then need to look at JRE version, Oracle Forms versions etc etc .....