Please, help me fix this error:
FATAL ERROR: i18n::include_by_class: Class not found
At line 1258 in D:\xampp\htdocs\silverstripe\sapphire\core\i18n.php
user_error(i18n::include_by_class: Class not found,512)
line 1258 of i18n.php
i18n::include_by_class()
line 125 of Core.php
_t(EXPORTCSV,Export to CSV)
line 139 of DataReport.php
DataReport->htmlExportButton()
line 11 of OrderReport.php
OrderReport->FieldHolder()
call_user_func_array(Array,Array)
line 376 of ViewableData.php
ViewableData->XML_val(FieldHolder,,1)
line 72 of .cacheD..xampp.htdocs.silverstripe.sapphire.templates.TabSetFieldHolder.ss
include(C:\Documents and Settings\admin\Local Settings\Temp\silverstripe-cacheD--xampp-htdocs-silverstripe\.cacheD..xampp.htdocs.silverstripe.sapphire.templates.TabSetFieldHolder.ss)
line 190 of SSViewer.php
SSViewer->process(TabSet)
line 729 of ViewableData.php
ViewableData->renderWith(TabSetFieldHolder)
line 39 of TabSet.php
TabSet->FieldHolder()
call_user_func_array(Array,Array)
line 376 of ViewableData.php
ViewableData->XML_val(FieldHolder,,1)
line 62 of .cacheD..xampp.htdocs.silverstripe.sapphire.templates.Includes.Form.ss
include(C:\Documents and Settings\admin\Local Settings\Temp\silverstripe-cacheD--xampp-htdocs-silverstripe\.cacheD..xampp.htdocs.silverstripe.sapphire.templates.Includes.Form.ss)
line 190 of SSViewer.php
SSViewer->process(Form)
line 729 of ViewableData.php
ViewableData->renderWith(Form)
line 601 of Form.php
Form->forTemplate()
line 392 of ViewableData.php
ViewableData->XML_val(EditForm,,1)
line 9 of .cacheD..xampp.htdocs.silverstripe.cms.templates.Includes.ReportAdmin_right.ss
include(C:\Documents and Settings\admin\Local Settings\Temp\silverstripe-cacheD--xampp-htdocs-silverstripe\.cacheD..xampp.htdocs.silverstripe.cms.templates.Includes.ReportAdmin_right.ss)
line 190 of SSViewer.php
SSViewer->process(ReportAdmin)
line 729 of ViewableData.php
ViewableData->renderWith(Array)
line 345 of LeftAndMain.php
LeftAndMain->Right()
call_user_func_array(Array,Array)
line 376 of ViewableData.php
ViewableData->XML_val(Right,,1)
line 96 of .cacheD..xampp.htdocs.silverstripe.cms.templates.LeftAndMain.ss
include(C:\Documents and Settings\admin\Local Settings\Temp\silverstripe-cacheD--xampp-htdocs-silverstripe\.cacheD..xampp.htdocs.silverstripe.cms.templates.LeftAndMain.ss)
line 190 of SSViewer.php
SSViewer->process(ReportAdmin)
line 245 of Controller.php
Controller->defaultAction(index,Array)
line 216 of Controller.php
Controller->run(Array)
line 76 of Director.php
Director::direct(/admin/reports/)
line 104 of main.php
Context
Debug (Debug::showError() in line 149 of Debug.php)
* class =
* module =