报表部署在docker中，加载报表报错如下：
TextFormat has no associated Font, and a default font could not be found. To avoid this situation, assign an available font to FontCollection.SystemFonts.DefaultFont if it is null.","errorCode":null,"errorData":[],"errorType":"Exception","stackTrace":" at GrapeCity.ActiveReports.Rendering.Tools.EnumerableExtension.ForceInBackground[T](IEnumerable`1 src, CancellationToken cancellationToken)+MoveNext()\n at GrapeCity.ActiveReports.Core.Export.Html.Page.HtmlRendering.RenderInStreamingMode(IReport report, Func`2 getStream, HtmlSettings settings, CancellationToken cancel, Action`1 onComplete)\n at GrapeCity.ActiveReports.Web.Viewer.I.\uE030.RenderHtmlView(Object document, Func`2 getOutStreamFn, \uE014 exportSettings, Action onPageReady, CancellationToken token)\n at GrapeCity.ActiveReports.Web.Viewer.I.\uE026.RenderHtmlView(Object document, Func`2 getOutStream, \uE014 settings, Action onPageReady, CancellationToken token)\n at GrapeCity.ActiveReports.Web.Viewer.I.\uE00C.\uE002.\uE000(Task`1 task)"
看描述是字体问题，以下是部署的目录，这个问题需要如何解决？
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