Error when connecting: "The procedure entry point (name) could not be located in the dynamic link library (name.dll)." (4310934)

The following error is displayed when connecting to a database. Unable to connect.

"The procedure entry point ons_init_wconfig_ctx could not be located in the dynamic link library oraons.dll."

or

"The procedure entry point knclgLcrRowGetBindVariables could not be located in Dynamic Link Library oracommon11.dll

or

"The procedure entry point ons_error_set could not be located in the dynamic link library C:\oracle\app\product\12.1.0\client_1\BIN\oraclient12.dll"