Erro no sqlnet

No sqlnet.log está aparecendo esse erro:Fatal NI connect error 12560, connecting to: (DESCRIPTION=(ADDRESS=(PROTOCOL=BEQ)(PROGRAM=oracle)(ARGV0=oracleORCL) (ARGS='(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))')) (CONNECT_DATA=(SID=ORCL)(CID=(PROGRAM=D:\PROJETOS\middleware\Fontes\Middleware.exe)(HOST=SOLUEMS)(USER=marilsa)))) VERSION INFORMATION: TNS for 32-bit Windows: Version 10.2.0.1.0 - Production Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 10.2.0.1.0 - Production Time: 12-ABR-2006 11:20:07 Tracing not turned on. Tns error struct: ns main err code: 12560 TNS-12560: Message 12560 not found; No message file for product=NETWORK, facility=TNS ns secondary err code: 0 nt main err code: 530 TNS-00530: Message 530 not found; No message file for product=NETWORK, facility=TNS nt secondary err code: 2 nt OS err code: 0Não estou entendendo esse erro.