Question Lỗi khi cài add-on

mình cài bất cứ add-on nào cũng bị lỗi

Mã:

An exception occurred: conversation_message - Line 16: Invalid condition expression in /home/lisharin/public_html/library/XenForo/Template/Compiler.php on line 991

XenForo_Template_Compiler->getNewCompilerException() in XenForo/Template/Compiler.php at line 1214
XenForo_Template_Compiler->_parseConditionExpression() in XenForo/Template/Compiler.php at line 1066
XenForo_Template_Compiler->parseConditionExpression() in XenForo/Template/Compiler/Tag/If.php at line 109
XenForo_Template_Compiler_Tag_If->compile() in XenForo/Template/Compiler.php at line 641
XenForo_Template_Compiler->compileTag() in XenForo/Template/Compiler.php at line 570
XenForo_Template_Compiler->compileSegment() in XenForo/Template/Compiler.php at line 509
XenForo_Template_Compiler->compileSegments() in XenForo/Template/Compiler.php at line 422
XenForo_Template_Compiler->compileIntoVariable() in XenForo/Template/Compiler/Tag/Hook.php at line 37
XenForo_Template_Compiler_Tag_Hook->compile() in XenForo/Template/Compiler.php at line 641
XenForo_Template_Compiler->compileTag() in XenForo/Template/Compiler.php at line 570
XenForo_Template_Compiler->compileSegment() in XenForo/Template/Compiler.php at line 509
XenForo_Template_Compiler->compileSegments() in XenForo/Template/Compiler.php at line 422
XenForo_Template_Compiler->compileIntoVariable() in XenForo/Template/Compiler/Tag/Include.php at line 113
XenForo_Template_Compiler_Tag_Include->compile() in XenForo/Template/Compiler.php at line 641
XenForo_Template_Compiler->compileTag() in XenForo/Template/Compiler.php at line 570
XenForo_Template_Compiler->compileSegment() in XenForo/Template/Compiler.php at line 509
XenForo_Template_Compiler->compileSegments() in XenForo/Template/Compiler.php at line 422
XenForo_Template_Compiler->compileIntoVariable() in XenForo/Template/Compiler/Tag/Include.php at line 113
XenForo_Template_Compiler_Tag_Include->compile() in XenForo/Template/Compiler.php at line 641
XenForo_Template_Compiler->compileTag() in XenForo/Template/Compiler.php at line 570
XenForo_Template_Compiler->compileSegment() in XenForo/Template/Compiler.php at line 509
XenForo_Template_Compiler->compileSegments() in XenForo/Template/Compiler.php at line 372
XenForo_Template_Compiler->compileParsed() in XenForo/Model/Template.php at line 1575
XenForo_Model_Template->compileAndInsertParsedTemplate() in XenForo/Model/Template.php at line 1443
XenForo_Model_Template->compileTemplateInStyleTree() in XenForo/Model/Template.php at line 1292
XenForo_Model_Template->compileNamedTemplateInStyleTree() in XenForo/Model/Template.php at line 1231
XenForo_Model_Template->compileAllTemplates() in XenForo/Deferred/Template.php at line 36
XenForo_Deferred_Template->execute() in XenForo/Model/Deferred.php at line 252
XenForo_Model_Deferred->runDeferred() in XenForo/Model/Deferred.php at line 378
XenForo_Model_Deferred->_runInternal() in XenForo/Model/Deferred.php at line 331
XenForo_Model_Deferred->run() in XenForo/ViewRenderer/Abstract.php at line 352
XenForo_ViewRenderer_Abstract::hasManualDeferredToRun() in XenForo/ViewRenderer/HtmlAdmin.php at line 130
XenForo_ViewRenderer_HtmlAdmin->renderContainer() in XenForo/FrontController.php at line 614
XenForo_FrontController->renderView() in XenForo/FrontController.php at line 158
XenForo_FrontController->run() in /home/lisharin/public_html/admin.php at line 13

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