If it is not permission issue, then it is because of the file is updating, so can not be open again, after the file updated, then it is done. In this case, it is not an error.
This is a know bug of an assert in save_to_buffer(), we have already fixed it in the coming release.
You can use the command to upgrade now.
/usr/local/lsws/admin/misc/lsup.sh -b -e 1.7.6
Thanks
David
For the cache entry "create entry failed", means the file or directory permission issue. Such as can not write a file, or the file is updating(a temp cache entry is creating and not done yet).
Are you sure you want to use php module, a separate php module?
There is a phpinfo.php in the example page which is handled by lsphp for your reference.