[SOLVED] Since upgrade to 6.0.5 not able to save any data. Always gets Technical Error

I am 100% sure that no one changed code and unzipping was done on server so there should not be any mistake.

I can see two ActivityMain.php files.
1. /model/ActivityMain.php
2. /model/custom/ActivityMain.php

/model/ActivityMain.php
protected function getStaticColCaptionTransposition($fld=null) {
protected function getStaticColCaptionTransposition($fld=null) {

return self::$_colCaptionTransposition;

}

/model/custom/ActivityMain.php
protected function getStaticColCaptionTransposition($fld) {
return self::$_colCaptionTransposition;
}


/model/persistance/SqlElement.php
protected function getStaticColCaptionTransposition($fld=null) {

return array();

}


Installed php version is 5.6

I removed the file mentioned by you. Now it logs me in and show all activities and all details however, whenever I try to save anything I get following error.

Technical issue occured possibly due to bad network connection.
Please try again.
If issue persists, please contact your administrator.
Contact your administrator.

Also when i try to add any note it shows following error.
ERROR : noteRefType parameter not found in REQUEST
Contact your administrator.