I have moved my old hosting to a new hosting and then this problem emerged as the site was working well before that I have read what I referred to, but I do not find any steps to solve the problem please help some steps

Have you followed the instructions at http://learn.elgg.org/en/3.2/admin/duplicate-installation.html (or at http://learn.elgg.org/en/2.3/admin/duplicate-installation.html for Elgg 2.3) when migrating to the new host? At least check if any database entries (as referred in the instructions) need to be updated depending on possible changes in paths to install directory and/or data directory between old and new server. Of course as already mentioned, permissions of the data directory must be correct to allow for writing into the data directory (to create the cache folder) or even to access the content of the data directory. It might also help to delete the sysem_cache and views_simplecache folders in the data directory to get rid of any possible old cache entries that are no longer valid on the new server (Elgg will automatically re-create these folders when necessary - as long as permissions of the data direcory allow it and as long as the database entries point to the correct location of the data directory).

Thanks for all the feedback the site is working now
Please delete the topic The problem has been resolved
Thank you