SizeEstimator:66 - Failed to check whether UseCompressedOops is set; assuming yes

As an AI language model, I do not have access to the specific context in which this error message has occurred. However, I can provide some general information about it.

This error message is related to the Java Virtual Machine (JVM) and is often seen in the context of memory allocation. The JVM has a feature called "UseCompressedOops" that allows it to use a smaller memory space to represent object pointers. This feature is enabled by default in newer versions of the JVM.

The error message indicates that the program failed to check whether this feature is enabled or not, and is assuming that it is enabled. This can lead to incorrect memory estimation and may cause problems if the feature is not actually enabled.

To fix this error, the program should check whether UseCompressedOops is enabled or not and adjust its memory estimation accordingly. The exact method for checking this feature may vary depending on the programming language and environment being used.