how to solve http 500 error when call web service?

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I test webserivce via the SICF.

where can I find log information?

what is my problem, and what need I do for this case?

below is my rfc enabled function and error message.

FUNCTION:

FUNCTION SAYHLLO.

*"----

""Local interface:

*" IMPORTING

*" VALUE(I_NAME) TYPE CHAR50

*" EXPORTING

*" VALUE(E_NAME) TYPE CHAR100

*"----

CONCATENATE 'Hello: ' i_name '!!' INTO e_name.

ENDFUNCTION

ERROR:

The website cannot display the page

HTTP 500

Most likely causes:

The website is under maintenance.

The website has a programming error.

What you can try:

Retype the address.

Go back to the previous page.

More information

This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying.

For more information about HTTP errors, see Help