SP16[OnPrem] - Error copying temporary solution file to solutions gallery (When save site as template)

Question

I have web site with template "Team site". When i saving site as template;

Fill template form: Then i click button OK, and have following error:

This is error by corelation ID from log files:

System.InvalidOperationException: Error copying temporary solution file to solutions gallery: _catalogs/solutions/LirexTempProject.wsp
at Microsoft.SharePoint.SPSolutionExporter.ExportWebToGallery(SPWeb web, String solutionFileName, String title, String description, ExportMode exportMode, Boolean includeContent, String workflowTemplateName, String destinationListUrl, Action`1 solutionPostProcessor, Boolean activateSolution) at Microsoft.SharePoint.ApplicationPages.SaveAsTemplatePage.BtnSaveAsTemplate_Click(Object sender, EventArgs e) at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

When i try from PowerShell(have the same error):

Answer 1

Uncheck the "include content" box and see if that works first - just to prove that making templates does work.

If it does work then increase the maximum size of the templates you are able to create by running the following:

param([string]$TemplateDocSize = 50000000)

[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")

[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Administration")


write-host "Getting Current Template Document Size"
$contentService = [Microsoft.SharePoint.Administration.SPWebService]::ContentService
write-host "Current Size:" $contentService.MaxTemplateDocumentSize
write-host "Resetting to Size:" 
$contentService.MaxTemplateDocumentSize = $TemplateDocSize
$contentService.Update()
write-host "New Size: " $contentService.MaxTemplateDocumentSize 

Copied from: https://gallery.technet.microsoft.com/office/Increase-the-template-97276459