pose_local_parameterization.h:8:1: error: expected class-name before ‘{’ token

This error message typically occurs in C++ when there is a syntax error in the code. In this case, it is indicating that there is an issue with the definition of a class in the file "pose_local_parameterization.h" on line 8.

The error message suggests that the opening curly brace '{' is unexpected, which might indicate that there is a missing or incorrect class name before it. This could be due to a typo or a missing header file that defines the class.

To fix this error, you should review the code on or before line 8 of the file and check for any syntax errors. Ensure that all classes are properly defined and that any necessary header files are included.