I need delete the slqnet.ora on my oracle home.
And I obtain this error when I try connect in any database.

Information:
PL/SQL Developer
Version 9.0.1.1613
156.75334 - 10 user license
Windows 6.2 Build 9200
Language: Brazilian (Allround Automations)

Physical memory : 2.097.152 kB (2.097.152 available)
Paging file : 4.194.304 kB (3.327.356 available)
Virtual memory : 2.097.024 kB (1.814.800 available)

Parameters
C:\Program Files\PLSQL Developer\plsqldev.exe

Preferences
Session mode: Multi
OCI Library:
Use OCI7: False
Allow Multiple Connections: True

Preference Files
C:\Program Files\PLSQL Developer\Preferences\Default\Default.ini
C:\Users\gesif\AppData\Roaming\PLSQL Developer\Preferences\gesif\default.ini

Plug-Ins

Aliases
AGRALE_PROD
SYNPRD
SYNPRD_nova
SYNTST

Homes
OraClient11g_SYNCHRO (C:\Program Files\Synchro\oracleclient11\)
OraClient12Home3 (C:\oracle\12.1.0\client)

DLLs
C:\oracle\12.1.0\client\bin\oci.dll

TNS File
C:\Program Files\Synchro\oracleclient11\network\admin\tnsnames.ora

Using
Home: OraClient12Home3
DLL: C:\oracle\12.1.0\client\bin\oci.dll
OCI: version 11.1