How to check this error for the 1st time ?
1. check firebird running or not, where to check
:- start > control panel > firebird OR
:- right click on my computer > manage > service and application > service
then look for firebird service and firebird guardian
try to stop firebird and run it again
IF THE FIREBIRD IS RUNNING PROPERLY then
2. check the database's path is correct or not means find the database