When i click magento adminpenal's
system>configuration The Error will caused.....
Fatal error: Class 'Mage_Facebookilike_Helper_Data' not found in C:\xampp\htdocs\magento\app\Mage.php on line 547
As per your error it looks like your Facebookilike Helper file is not getting loaded properly. Generally this issue occurs when the Helper is not defined properly in the config file.
Please recheck it once this might be the cause.
Mage_Facebookilike_Helper_Data -> Mage_Facebooklike_Helper_Data
I think in your extension/ code you are accessing a helper which is not defined like
So try to find out this type of code or declare the helper in your own config.xml of that extension as
<global> <helpers> <facebookilike> <class>Mage_Facebookilike_Helper</class> </facebookilike> </helpers> </global>