Use of 'spaces' parameter of tagcloud macro throw error when following the example

Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getTagCountForQuery' in  class com.xpn.xwiki.plugin.tag.TagPluginApi threw exception com.xpn.xwiki.XWikiException: Error number 0 in 3: Failed to get tag count for query [select elements(prop.list) from XWikiDocument as doc, BaseObject as tagobject, DBStringListProperty as prop where tagobject.name=doc.fullName and tagobject.className='XWiki.TagClass' and tagobject.id=prop.id.id and prop.id.name='tags' and doc.space IN("'TagSpaceTest1','TagSpaceTest2'")], with parameters [[]] at 135:xwiki:Dashboard.WebHome[line 22, column 30]