Akeeba backup for WP PRO 2.4.2:
The plugin could not be enabled because it caused a critical error.
Parse error: syntax error, unexpected T_STRING, expecting T_CONSTANT_ENCAPSED_STRING or '(' in /wp-content/plugins/akeebabackupwp/helpers/AkeebaBackupWP.php on line 3
Akeeba Backup for WP PRO 3.1.1:
The plugin could not be enabled because it caused a critical error.
Parse error: syntax error, unexpected '[' in /wp-content/plugins/akeebabackupwp/akeebabackupwp.php on line 56
Do You have any suggestion what may couse it, a way to avoid this?