ISSUE IN INSTALLING/UPDATING LAST VERSION

[inspectorflint]

Hello

I am trying to install a new installation of corebos's last version but, cloning the git´s repository, and after fill the data of database and admin user , instalation stops and show this message:

Fatal error: Uncaught Error: Call to a member function FetchRow() on bool in /homepages/18/d578145843/htdocs/coreboslast/corebos/include/database/PearDatabase.php:650 Stack trace: #0 /homepages/18/d578145843/htdocs/coreboslast/corebos/modules/com_vtiger_workflow/expression_functions/loadfromDB.php(18): PearDatabase->fetch_array(false) #1 /homepages/18/d578145843/htdocs/coreboslast/corebos/modules/com_vtiger_workflow/expression_engine/VTExpressionEvaluater.inc(447): include_once('/homepages/18/d...') #2 /homepages/18/d578145843/htdocs/coreboslast/corebos/modules/com_vtiger_workflow/expression_engine/include.inc(12): require_once('/homepages/18/d...') #3 /homepages/18/d578145843/htdocs/coreboslast/corebos/modules/com_vtiger_workflow/VTSimpleTemplate.inc(13): require_once('/homepages/18/d...') #4 /homepages/18/d578145843/htdocs/coreboslast/corebos/modules/com_vtiger_workflow/VTEntityCache.inc(11): require_once('/homepages/18/d...') #5 /homepages/18/d578145843/htdocs/coreboslast/corebos/modules/com_vtiger_workflow/VTWorkflowM in /homepages/18/d578145843/htdocs/coreboslast/corebos/include/database/PearDatabase.php on line 650


If I try to udpate older version, at the same moment shows the same error:

Fatal error: Uncaught Error: Call to a member function FetchRow() on bool in /homepages/18/d578145843/htdocs/corebos8/corebos8/include/database/PearDatabase.php:650 Stack trace: #0 /homepages/18/d578145843/htdocs/corebos8/corebos8/modules/com_vtiger_workflow/expression_functions/loadfromDB.php(18): PearDatabase->fetch_array(false) #1 /homepages/18/d578145843/htdocs/corebos8/corebos8/modules/com_vtiger_workflow/expression_engine/VTExpressionEvaluater.inc(447): include_once('/homepages/18/d...') #2 /homepages/18/d578145843/htdocs/corebos8/corebos8/modules/com_vtiger_workflow/expression_engine/include.inc(12): require_once('/homepages/18/d...') #3 /homepages/18/d578145843/htdocs/corebos8/corebos8/modules/com_vtiger_workflow/VTSimpleTemplate.inc(13): require_once('/homepages/18/d...') #4 /homepages/18/d578145843/htdocs/corebos8/corebos8/modules/com_vtiger_workflow/VTEntityCache.inc(11): require_once('/homepages/18/d...') #5 /homepages/18/d578145843/htdocs/corebos8/corebos8/modules/com_vtiger_workflow/VTWorkflowManager.inc(12) in /homepages/18/d578145843/htdocs/corebos8/corebos8/include/database/PearDatabase.php on line 650

What can be the problem? Thank you