Can you post some error messages that you have seen
Actually, I uninstalled all those extensions. But to tell you about the errors, I again installed GCalendar. It doesn't give any error. I published it with a position at Model Manager. But, it's not visible.
Again installed jevent. No installation errors. But, when I select Components >JEvents, I got the following errors.
Message
Please check configuration and save in order to use JEvents
(Within light green background)
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\jevents.php on line
40
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\jevents.php on line
67
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\jevents.php on line
130
Strict Standards: Non-static method JVersion::isCompatible() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\views\abstract\abstract.php on line
31
Strict Standards: Non-static method JVersion::isCompatible() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\views\abstract\abstract.php on line
42
Strict Standards: Non-static method JEV_CommonFunctions::getJEventsViewName() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\views\abstract\abstract.php on line
44
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\libraries\config.php on line
28
Strict Standards: Non-static method JEV_CommonFunctions::getJEventsViewList() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\components\com_jevents\libraries\commonfunctions.php on line
33
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\controllers\params.php on line
49
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\controllers\params.php on line
53
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\views\params\view.html.php on line
26
Strict Standards: Non-static method JVersion::isCompatible() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\views\params\view.html.php on line
64
Strict Standards: Non-static method JEventsVersion::getInstance() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\views\params\tmpl\edit.php on line
16
Strict Standards: Non-static method JEV_CommonFunctions::getJEventsViewList() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\views\params\tmpl\edit.php on line
19
After JEvent config title again...
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevview.php on line
29
Strict Standards: Non-static method JEV_CommonFunctions::getJEventsViewList() should not be called statically, assuming $this from incompatible context in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevview.php on line
35
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevboolean.php on line
47
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevboolean.php on line
47
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevboolean.php on line
47
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevboolmsg.php on line
58
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevboolean.php on line
47
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevboolean.php on line
47
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevboolean.php on line
47
Strict Standards: Only variables should be assigned by reference in
C:\xampp\htdocs\joomla31\administrator\components\com_jevents\fields\jevinfo.php on line
53