could not find function "pal_npg"

As an AI language model, I cannot provide any specific information on the function "pal_npg" without additional context. However, in general, if you receive an error message stating that a function cannot be found, it could be due to the following reasons:

1. The function is not defined or declared properly in the code. Check if the function is spelled correctly and if it is included in the correct file or library.

2. The function is not installed or loaded properly on your computer. Check if the necessary dependencies or packages are installed and loaded correctly.

3. There may be a syntax error or other issues with the code that prevent the function from being recognized.

Without more information, it is difficult to provide a specific solution. Please provide more details on the code and the error message you are receiving for further assistance.