I get "Code '500' :: Unable to complete request, try again!" error when trying to use Transkribus OCR on Ukrainian Wikisource. It seems to happen with all pages, no matter how many times I try. I tried Printed Ukrainian 20th century and Ukrainian generic handwriting 1 models.
Pages to try: https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/%C2%AB%D0%A0%D0%BE%D0%B7%D0%B2%D0%B0%D0%B3%D0%B0%C2%BB._%D0%9A%D0%B0%D0%BB%D1%94%D0%BD%D0%B4%D0%B0%D1%80_%D0%BF%D0%BE%D0%BB%D0%BE%D0%BD%D0%B5%D0%BD%D0%B8%D1%85_%D0%A3%D0%BA%D1%80%D0%B0%D1%97%D0%BD%D1%86%D1%96%D0%B2_%D0%BD%D0%B0_%D1%80%D0%BE%D0%BA%D0%B8_1916._%D1%96_1917._1916.pdf/page160-1828px-%C2%AB%D0%A0%D0%BE%D0%B7%D0%B2%D0%B0%D0%B3%D0%B0%C2%BB._%D0%9A%D0%B0%D0%BB%D1%94%D0%BD%D0%B4%D0%B0%D1%80_%D0%BF%D0%BE%D0%BB%D0%BE%D0%BD%D0%B5%D0%BD%D0%B8%D1%85_%D0%A3%D0%BA%D1%80%D0%B0%D1%97%D0%BD%D1%86%D1%96%D0%B2_%D0%BD%D0%B0_%D1%80%D0%BE%D0%BA%D0%B8_1916._%D1%96_1917._1916.pdf.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/%C2%AB%D0%A0%D0%BE%D0%B7%D0%B2%D0%B0%D0%B3%D0%B0%C2%BB._%D0%9A%D0%B0%D0%BB%D1%94%D0%BD%D0%B4%D0%B0%D1%80_%D0%BF%D0%BE%D0%BB%D0%BE%D0%BD%D0%B5%D0%BD%D0%B8%D1%85_%D0%A3%D0%BA%D1%80%D0%B0%D1%97%D0%BD%D1%86%D1%96%D0%B2_%D0%BD%D0%B0_%D1%80%D0%BE%D0%BA%D0%B8_1916._%D1%96_1917._1916.pdf/page266-1827px-%C2%AB%D0%A0%D0%BE%D0%B7%D0%B2%D0%B0%D0%B3%D0%B0%C2%BB._%D0%9A%D0%B0%D0%BB%D1%94%D0%BD%D0%B4%D0%B0%D1%80_%D0%BF%D0%BE%D0%BB%D0%BE%D0%BD%D0%B5%D0%BD%D0%B8%D1%85_%D0%A3%D0%BA%D1%80%D0%B0%D1%97%D0%BD%D1%86%D1%96%D0%B2_%D0%BD%D0%B0_%D1%80%D0%BE%D0%BA%D0%B8_1916._%D1%96_1917._1916.pdf.jpg