Integrity constraint violation: 1062 Duplicate entry '1' for key 'tblconfiguration.PRIMARY' Errors
Symptom
On step 4 of installation (the install.php
page), after entering your WHMCS license key and database connection details, a Oops! Something went wrong and we couldn't process your request
message displays.
You may also see an Integrity constraint violation
error message in WHMCS or in the tblerrorlog
table of WHMCS's MySQL® database:
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '1' for key 'tblconfiguration.PRIMARY'
![](https://media.screensteps.com/image_assets/assets/006/954/046/original/9809a32d-8572-4950-afbc-dbd18c0c0dc6.png)
Cause
You have initiated the installation process twice simultaneously, causing the system to attempt to write duplicate data to the MySQL database.
This could be due, for example, to website monitoring tools or other visitors accessing the WHMCS index.php
file at the exact moment the installation is in progress.
Solution
To resolve this issue:
- Temporarily deactivate monitoring or similar tools that might access the WHMCS directory.
- Restrict access to the WHMCS directory from other IP addresses until the installation process is complete. For more information, see Restricting Access by IP Address.
- Drop the contents of WHMCS's MySQL database.
- Return to the
install.php
page and start the installation process again.