Could not initialize oci.dll

[Carey]

I'm setting up 64 bit PL/SQL Developer 13 on a Windows 10 Parallels VM on a Mac. I'm using the 64 bit Instant Client for Windows, and put it into a folder named InstantClient in the PL/SQL Developer folder.
The error is this: "Could not initialize C:\Program Files\PLSQL Developer 13\InstantClient\oci.dll. Make sure you have the 64 bits Oracle Client installed. OCIDLL forced to C:\Program Files\PLSQL Developer 13\InstantClient\oci.dll Load Library(C:\Program Files\PLSQL Developer 13\InstantClient\oci.dll) returned 0."

I've tried 32 and 64 bit versions of the Instant Client and the full client, for 12 and 19. I get slightly different messages for each, but they are all about the oci.dll not loading or initializing.

 

[Marco Kalter]

Does the Instant Client package include the SQL*Plus package? If not, you can download the optional Instant Client SQL*Plus from the Oracle web site and add it.

Start sqlplus.exe to check if the Instant Client is functioning correctly.

 

[Carey]

Yes, I have the SQL*Plus package, and it is working.

 

[fabrice]

Do you have a tnsnames.ora in your environment?