I've installed Umbraco version 7.8.1 from scratch.

1. Open Developer section
2. Click on "..." near XSLT files, get create XSLT fpom.
3. Enter new name ("asd", but get same result with any name)
4. Choose "Clean" snippet (reproduce with all other snippets in fact), uncheck "Create macro". Click "Create"
5. Always get an error

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Server Error in '/' Application.

Could not task for operation Create for node type xslt 
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.InvalidOperationException: Could not task for operation Create for node type xslt

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: 


[InvalidOperationException: Could not task for operation Create for node type xslt]
   Umbraco.Web.UI.LegacyDialogHandler.Create(HttpContextBase httpContext, User umbracoUser, String nodeType, Int32 nodeId, String text, Int32 typeId) +285
   umbraco.presentation.create.xslt.sbmt_Click(Object sender, EventArgs e) +391
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +11764877
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +150
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1665


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.2558.0 

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XSLT file not created on a disk, When I refresh Developer section, there will be no XSLT files. If I check "Create macro", I get same error and macro is not created.

I can add XSLT file manually to XSLT folder on a disk, In this case I'll see XSLT in Developer section of Umbraco admin, can edit it, can save and can create macro. The problem is onmy with creating new file from admin UI.