i have got this error and i don't know why

i try ton connect firebird with a jdbc connection i work on windows nt

can you help me?
thanks

9 sept. 02 17:35:46@pc04723-ttb\Database connection manager:main(??):T3
Error connecting to database

9 sept. 02 17:35:46@pc04723-ttb\Loader:main(??):T3
Error loading com.slb.tt.genSrv.Services.TreeManager.parking.ParkTreeHandler
Exception : com.slb.tt.genSrv.Components.Utilities.ModuleLoadException:
com.slb.tt.genSrv.Services.TreeManager.parking.ParkTreeHandler :
java.lang.Exception: Database connection error
Details : com.slb.tt.genSrv.Services.TreeManager.parking.ParkTreeHandler
:
java.lang.Exception: Database connection error
Stack Trace :