Why is jqgrid not being filled, leading to the error message "TypeError: Cannot read properties of null (reading 'iColByName')"?

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There could be multiple reasons why jqgrid is not being filled and leads to the error message "TypeError: Cannot read properties of null (reading 'iColByName')". Here are a few possible reasons:

1. Incorrect configuration: If the jqGrid configuration is incorrect or incomplete, the grid may not be filled with the data. This may be due to an incomplete or incorrect URL, a missing datatype, or a missing colModel.

2. Incorrect data format: If the data format returned by the server is incorrect or does not match the expected format, the grid may not be filled with the data. This may be due to an incorrect response type, improper JSON format, or missing data.

3. Data retrieval failure: If the server fails to retrieve the requested data, the grid may not be filled with the data. This failure may be due to server-side issues or incorrect server-side code.

4. JavaScript errors: The error message "TypeError: Cannot read properties of null (reading 'iColByName')" may also occur due to other JavaScript errors on the page. These errors can prevent the grid from being filled with data or can trigger other errors in jqGrid.

To resolve the issue, the code must be reviewed, and the respective errors must be addressed.