unable to upgrade from 6.1.1 to 6.1.14

[Linda]

Hi - when I upgrade I am no longer able to access my backend - I can login, but am stuck on the home page of the backend. Error msgs are as follows:

1.Premature end of script headers: ajax-tab.php,

 

2.PHP Fatal error: Uncaught Error: [] operator not supported for strings in /home/sheetmus/public_html/classes/db/DbQuery.php:96

 

3.[error] [client 10.80.0.98] Stack trace:

 

4.[error] [client 10.80.0.98] #0 /home/sheetmus/public_html/Adapter/Adapter_EntityMapper.php(45): DbQueryCore->from('shop', 'a'),

 

5.error] [client 10.80.0.98] #1 /home/sheetmus/public_html/classes/ObjectModel.php(233): Adapter_EntityMapper->load('1', NULL, Object(Shop), Array, NULL, true),

 

6.[error] [client 10.80.0.98] #2 /home/sheetmus/public_html/classes/shop/Shop.php(131): ObjectModelCore->__construct('1', NULL, NULL),

 

7.[error] [client 10.80.0.98] #3 /home/sheetmus/public_html/classes/shop/Shop.php(397): ShopCore->__construct('1'), referrer

 

8.error] [client 10.80.0.98] #4 /home/sheetmus/public_html/config/config.inc.php(114): ShopCore::initialize(), referrer

 

9.error] [client 10.80.0.98] #4 /home/sheetmus/public_html/config/config.inc.php(114): ShopCore::initialize(), referrer

 

10.[error] [client 10.80.0.98] #6 {main}, referer:

 

11. [error] [client 10.80.0.98] thrown in /home/sheetmus/public_html/classes/db/DbQuery.php on line 96, referer:

Any pointers on how I can fix this are deeply appreciated.

[bellini13]

what is your exact version of PHP?