MOSS 2007 ERROR: "Unable to find an entry point" when trying to edit page - Sharepoint

When I try to edit sharepoint page, get a error:

Server Error in '/' Application.
--------------------------------------------------------------------------------

Unable to find an entry point named 'OshFGetSafeHTMLAllocForManaged3'
in DLL 'osafehtm.dll'.
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.

Exception Details: System.EntryPointNotFoundException: Unable to find
an entry point named 'OshFGetSafeHTMLAllocForManaged3' in DLL
'osafehtm.dll'.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace
below.

Stack Trace:


[EntryPointNotFoundException: Unable to find an entry point named
'OshFGetSafeHTMLAllocForManaged3' in DLL 'osafehtm.dll'.]

Microsoft.SharePoint.Publishing.Fields.NativeMethods.OshFGetSafeHTMLAllocForManaged3(Byte[]
htmlSourceBytes, Int32 htmlSourceBytesSize, Int32 htmlSourceCodePage,
Byte** htmlReturnedBytes, Int32& htmlReturnedBytesSize, Int32
convertToDestinationCodePage, Int32 safeHtmlBehaviorFlags, String[]
tagsToHandle, Int32[] tagHandlingFlags, Int32 tagHandlingCount, Int32&
tagHandlingResultFlags, EditOrDropUrlsDelegate urlHandlingCallback,
Boolean& isSafeHtml) +0

Microsoft.SharePoint.Publishing.Fields.SafeHtmlWrapper.GetSafeHtml(String
stylecopStringUnsafeHtml, Int32 safeHtmlBehaviorFlags, Hashtable
tagsAndFlags, Int32& tagHandlingResultFlags, Boolean handleUrls,
Boolean onlyUrlsInThisSite, Guid guidOfThisSite, Boolean&
urlsWereDropped, Boolean& isSafeHtml) +562

Microsoft.SharePoint.Publishing.Fields.SafeHtmlWrapper.MakeSafe(String
stylecopStringUnsafeHtml, Hashtable tagsAndFlags, Int32&
tagHandlingResultFlags, Boolean onlyUrlsInThisSite, Guid
guidOfThisSite, Boolean& urlsWereDropped, Int32 safeHtmlBehaviorFlags)
+78

Microsoft.SharePoint.Publishing.Fields.HtmlValidationContext.ValidateHtml(String
inputHtml, Boolean& tagsWereDropped, Boolean& urlsWereDropped) +1581

Microsoft.SharePoint.Publishing.WebControls.RichHtmlField.Validate()
+859
System.Web.UI.Page.Validate() +133

Microsoft.SharePoint.Publishing.WebControls.EditingMenuActions.ConsoleAction.EnsureItemSavedIfEditMode(Boolean
forceSave) +176

Microsoft.SharePoint.Publishing.WebControls.EditingMenuActions.PublishAction.RaisePostBackEvent(String
eventArgument) +146
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
+174
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+5102