When i go to the XOOPS Administration menu -> click on Articles -> click on the Edit icon with a pencil image for any article -> scroll down the page is incomplete. There is no "Save" button. This started happening recently.

I am using version 2.0.13 version of xoops

In the php debug mode I got this:

Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variable references should be returned by reference in file kernel/config.php line 188
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 108
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 97
Notice [PHP]: Only variable references should be returned by reference in file kernel/configitem.php line 100
Notice [PHP]: Only variable references should be returned by reference in file include/functions.php line 493
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variables should be assigned by reference in file include/cp_functions.php line 57
Notice [PHP]: Only variable references should be returned by reference in file class/module.textsanitizer.php line 257
Notice [PHP]: Only variable references should be returned by reference in file kernel/object.php line 289
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variable references should be returned by reference in file class/module.textsanitizer.php line 257
Notice [PHP]: Only variable references should be returned by reference in file class/module.textsanitizer.php line 257
Notice [PHP]: Only variable references should be returned by reference in file class/module.textsanitizer.php line 257
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variable references should be returned by reference in file class/xoopsform/form.php line 324
Notice [PHP]: Only variables should be assigned by reference in file class/xoopsform/formdhtmltextarea.php line 132
Notice [PHP]: Only variable references should be returned by reference in file class/database/database.php line 128
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variables should be assigned by reference in file class/xoopsform/formdhtmltextarea.php line 132
Notice [PHP]: Only variable references should be returned by reference in file class/database/database.php line 128
Notice [PHP]: Only variables should be assigned by reference in file class/database/mysqldatabase.php line 239
Notice [PHP]: Only variable references should be returned by reference in file class/database/mysqldatabase.php line 386
Notice [PHP]: Only variable references should be returned by reference in file class/module.textsanitizer.php line 257
Notice [PHP]: Only variable references should be returned by reference in file kernel/object.php line 289
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