|Do I answer yes or no?|
Either. Unless you have a Java Script debugger installed the end result will be the same. The error will be dismissed until the next time. You will only have a Java Script debugger installed if you have the Java development tools. A registry cleaner will not fix a Java script error.
Disabling the debugger as described above is thing thing to do. It wont fix the error but it will stop you getting the error message. You could try reinstalling Java runtime but the error may be from the web site itself and there is nothing you can do about that except except report it.
Steer well clear of these Registry Cleaners that claim to fix registry errors. They are at best useless, at worst, dangerous. If you really do have a registry error Windows will pick it up soon enough. Claiming to fix registry errors from third part applications is just pie in the sky.
Crap cleaner is safe as all it does is remove redundant entries. For a registry cleaner to scan and repair a registry with any degree of reliability would take hours and still not get it right. Windows registry is such a complex thing that even Microsoft withdrew there own registry cleaner because of the complexity of checking all possibilities.