Memory limitation in older versions. Fix: Update to the latest version (memory handling improved in v1.6+). Alternatively, try extracting the .AHZ (it is a ZIP) and open the inner .AHS file.
The AHS Log Viewer is a Windows-based application (with a Linux version available via script) designed to parse the binary AHS files extracted from iLO. Unlike older generation logs, AHS logs are binary encoded and cannot be read with a simple text editor like Notepad. hpe ahs log viewer download upd