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Hi, I am facing the same problem. I am not able to get around it. The OCI dll file is in path and everything. But Toad is not able to find it - how can I solve this problem? Did anyone find solution to this problem?
The first thing you should do is make sure you have ORACLE_HOME set properly. After that, make sure that ORACLE_HOME\bin is in your PATH. Assuming both of those are set properly, you should be getting more useful messages.
In the particular TOAD case, you can set an explicit location for the OCI dll using the OCIDLL environment variable.
another reason i encountered this error was due to the absence of a middleware. after you set your environment/system variables, ensure that you have oracle (express edition or regular) installed.