anyone can help me with instalation this error?

[allrist3]

greeting to all
hello, i m new member here, i dont know if i miss something pre instalaltion here, need some advice and help with this,, i try to install web erp in subdomain and got this when try to access the web ( freess after unpacking weberp file"

"Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at webmaster@erp.solusi-it.net to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request."

link" erpdemo@solusi-it.net

i really appreciate to someone who can help me with it ...
regards

allrist