Did you unpack MobileJoomla package into that directory? Please, clear that directory and unpack Mobile-Joomla.2.1.25.tar.gz (or other version you have) to that directory, and then run Install from Directory in Joomla's Installer component.

Sorry, but it looks like there is some misunderstanding. I thought you are now trying to help me install your Errorlogging plugin, not MobileJoomla? Otherwise, I had no problem installing MobileJoomla 2.1.25, but after installing I have problems with some pages of my site. Or do you suggest that I re-install MobileJoomla 2.1.25 by first uploading it to that directory and then installing from there?

Yes, I'm sorry for this misunderstanding.

As to the plugin, the version for Joomla! 2.5+ was attached by mistake. Here is version for Joomla! 1.5.

Thank you. Now I could install errorlogging plugin and have reproduced the error for two pages:
m.sahajayogaportal.org/mobile-test.html and m.sahajayogaportal.org/sabahmed

Now should I upload MobileJoomla and re-install it from directory or should I wait first till you have a look at the error_log file? (I've renamed the file to error_log.txt because php extension seems not to be allowed for upload).

I see several

ERROR: Class 'JDocumentRendererHead' not found in /home/sahajayo/public_html/plugins/system/articlesanywhere/helper.php on line 979

in your log file. Could you try to temporary disable Articles Anywhere plugin and check mobile version of your website again?

What version of Articles Anywhere do you use? Seems latest one with support of Joomla! 1.5 (ver. 2.4.6) doesn't contain reference to JDocumentRendererHead in its sources.

Yes, when I disabled Articles Anywhere, those pages started loading without an error. But I can't do without that plugin, it's used too much in my site.

I couldn't find which version is installed on my site, it doesn't write the version anywhere. But is should be one that supports Joomla 1.5, I suppose.

I've checked that your version is 1.6.1, so I'll try to download and check this version. Don't you like to update Articles Anywhere to ver. 2.4.6?

Unfortunately, currently there is no way to download version 1.6.1 from regularlabs.com. Articles Anywhere 2.4.6 is the oldest available release.

Would you suggest that I install Articles Anywhere 2.4.6? I don't think that could cause any trouble, in the least case I have a backup of my site. But do you think updating it to 2.4.6 may help?