Hi,
The problem is exactly as stated in the error message: ODBC driver manager failed to find the Data Source Name (DSN) specified in the connection string.
As you are using 64-bit TestComplete, you must have 64-bit Oracle drivers installed and 64-bit DSN configured. In order to create and configure 64-bit DSN start odbcad32.exe utility from the <Windows>\System32\ folder.
You may consider using 32-bit flavor of TestComplete (located in the <TestComplete>\bin\ folder). In this case 32-bit DSN with 32-bit Oracle driver will be required. In order to create and configure 32-bit DSN you must use odbcad32.exe utility from the <Windows>\SysWOW64\ folder.
