Radio SRF 2 Kultur feiert 65-jähriges Jubiläum

Fehler bei der Verarbeitung der Vorlage.
Can't convert this string to number: "Radio+SRF+2+Kultur+Programm+von+1956.pdf"
The blamed expression:
==> x?number  [in template "GLOBAL.TEMPLATE.UTILS" at line 132, column 36]

----
FTL stack trace ("~" means nesting-related):
	- Failed at: #assign groupId = x?number  [in template "GLOBAL.TEMPLATE.UTILS" in function "getFileEntyByArticleDocumentElement" at line 132, column 17]
	- Reached through: @fileDownload file=getFileEntyByArtic...  [in template "SRF_MEDIEN.TEMPLATE.BASE_NEWS" at line 259, column 19]
	- Reached through: #include "${templatesPath}/SRF_MEDIEN...  [in template "20115#20151#SRF_MEDIEN.TEMPLATE.GENERAL_COMMUNICATION" at line 3, column 1]
----
1<!-- Managed by liferay site initializer client extension --> 
2 
3<#include "${templatesPath}/SRF_MEDIEN.TEMPLATE.BASE_NEWS" />