Which language do you use. Try to reinstall your main language.

@o0odicemano0o see https://docs.joomla.org/J3.x:Changes_in_language_file_loading

Closed as answered

@hacki65 I tried removing and reinstalling the language pack.. Still I'm seeing the issue.

Try this patch: #15620

and tell us if you have the issue also with en-GB or only the pack you try to install, and in this case which pack?

I'm only using the en-GB pack. Same issue with this pack.

Then it cetainly means your server does not accept parse_ini_file.
please test the patch proposed here #15620

diff --git a/libraries/joomla/language/language.php b/libraries/joomla/language/language.php
index 1eb40fb..9c98ad9 100644
--- a/libraries/joomla/language/language.php
+++ b/libraries/joomla/language/language.php
@@ -830,7 +830,21 @@ protected function parse($filename)
 			ini_set('track_errors', true);
 		}
 
-		$strings = @parse_ini_file($filename);
+		if (!function_exists('parse_ini_file'))
+		{
+			$contents = file_get_contents($filename);
+			$contents = str_replace('_QQ_', '"\""', $contents);
+			$strings = @parse_ini_string($contents);
+		}
+		else
+		{
+			$strings = @parse_ini_file($filename);
+		}
+
+		if (!is_array($strings))
+		{
+			$strings = array();
+		}
 
 		// Restore error tracking to what it was before.
 		if ($this->debug)
@@ -840,7 +854,7 @@ protected function parse($filename)
 			$this->debugFile($filename);
 		}
 
-		return is_array($strings) ? $strings : array();
+		return $strings;
 	}

• means delete the line and do not let there the - sign

• means add the line without the + sign

This is frustrating..