An error has occurred

An error has been generated by the application.

exerr:ERROR XPTY0004: The actual cardinality for parameter 1 does not match the cardinality declared in the function's signature: docbook:toc-db5($node as node()) element(ul). Expected cardinality: exactly one, got 0. [at line 55, column 26, source: /db/apps/doc/modules/docbook.xql]
In function:
	docbook:toc-db5(node()) [55:9:/db/apps/doc/modules/docbook.xql]
	docbook:toc(node(), map(*)) [-1:-1:/db/apps/doc/modules/docbook.xql]
	templates:process-output(element(), map(*), item()*, element(function)) [211:9:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call-by-introspection(element(), map(*), map(*), function(*)) [189:28:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call(item(), element(), map(*)) [137:36:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [148:81:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [148:81:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [237:13:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [148:81:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [148:81:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [148:81:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [148:81:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [-1:-1:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	lib:parse-params(node(), map(*), xs:string?, xs:string?) [-1:-1:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/lib.xqm]
	templates:process-output(element(), map(*), item()*, element(function)) [211:9:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call-by-introspection(element(), map(*), map(*), function(*)) [189:28:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call(item(), element(), map(*)) [137:36:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [237:13:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process-output(element(), map(*), item()*, element(function)) [211:9:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call-by-introspection(element(), map(*), map(*), function(*)) [189:28:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call(item(), element(), map(*)) [137:36:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [435:17:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process-output(element(), map(*), item()*) [230:9:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process-output(element(), map(*), item()*, element(function)) [211:9:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call-by-introspection(element(), map(*), map(*), function(*)) [189:28:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:call(item(), element(), map(*)) [137:36:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [133:51:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:process(node()*, map(*)) [90:9:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]
	templates:apply(node()+, function(*), map(*)?, map(*)?) [29:5:/home/existdb/exist-db.org/exist-distribution-6.2.0/etc/../data/expathrepo/templating-1.1.0/content/templates.xqm]