Error: "Cannot obtain Oracle Client information from registry"

Error: "Cannot obtain Oracle Client information from registry"

This error typically means that either:
  1. the Oracle Client is not installed, or
  2. the bitness (x86/x64) of your application does not match the installed Oracle Client.
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📌 For 32-bit applications (x86)

1. Ensure that the "Platform target" is set to x86 (not "Any CPU").
 

 

2. Install the 32-bit Oracle Client

Download from:
👉 https://www.oracle.com/database/technologies/instant-client/microsoft-windows-32-downloads.html
 
3. Check the PATH environment variable

Ensure that the path to the Oracle client appears first in the list if multiple clients are installed.
Alternatively, set the ORACLE_HOME environment variable manually.

4. Configure TNS
​
Create or update the tnsnames.ora file in:

%ORACLE_HOME%\instantclient_19_10\network\admin\tnsnames.ora
​

📌 For 64-bit applications (x64)

1. Ensure that the "Platform target" is set to x64 (not "Any CPU").

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2. Install the 64-bit Oracle Client
​
Download from:

3. Check the PATH environment variable
​
Ensure that the path to the 64-bit Oracle client is listed first, or set the ORACLE_HOME variable appropriately.

4. Configure TNS
​
Set up the correct TNS configuration in:

%ORACLE_HOME%\instantclient_19_10\network\admin\tnsnames.ora