magento error code!

[dx.cdkey16]

Hello, i just installed in my webpage magento software and now if i go my admin or store page it show me always same error but if i go Demo page it work!

Can somone help me bit the erroro code is:

There has been an error processing your request

Exception printing is disabled by default for security reasons.
Error log record number: 909105120240



Please Help!

Thank you!

[xav0989]

Your software is trying to use more memory than there is available.