Error when executing PL/SQL script

I'm trying to run a script in PL/SQL

when I run it, Oracle replies
"The requested URL /apex/ was not found on this server"

If I keep on pressing 'RUN', sometimes, the program will run.....Other times a popup box comes up and says "Enter bind variables"  There is just a 'submit' button which I press....

Any help?
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Jinesh KamdarCommented:
You might have used an ampersand (&) in a value-string. Post the code here.

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Fekrat El WehediInfrastructure Architect / Oracle DBACommented:
Would you mind posting the PLSQL code so that we can analyze it for you and find the errors in it.
iannarAuthor Commented:
I re-installed oracle and it worked ok.
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