Two properties which expand to the same keyword have been detected. This might occur if a keyword and an alias thereof are used at the same time.

Multiple conflicting indexes have been found for the same node.

Maximum number of @context URLs exceeded.

A cycle in IRI mappings has been detected.

The value of @direction is not "ltr", "rtl", or null and thus invalid.

An invalid base IRI has been detected, i.e., it is neither an absolute IRI nor null.

An @container entry was encountered whose value was not one of the following strings: @list, @set, @language, @index, @id, @graph, or @type.

An entry in a context is invalid due to processing mode incompatibility.

An attempt was made to nullify a context containing protected term definitions.

The value of the default language is not a string or null and thus invalid.

An @id entry was encountered whose value was not a string.

An invalid value for @import has been found.

An included block contains an invalid value.

An @index member was encountered whose value was not a string.

A local context contains a term that has an invalid or missing IRI mapping.

An invalid JSON literal was detected.

An invalid keyword alias definition has been encountered.

An invalid value in a language map has been detected. It MUST be a string or an array of strings.

An @language entry in a term definition was encountered whose value was neither a string nor null and thus invalid.

A language-tagged string with an invalid language value was detected.

A number, true, or false with an associated language tag was detected.

An invalid local context was detected.

An invalid value for @nest has been found.

An invalid value for @prefix has been found.

An invalid value for @propagate has been found.

An invalid value for @protected has been found.

No valid context document has been found for a referenced remote context.

An invalid reverse property definition has been detected.

An invalid reverse property map has been detected. No keywords apart from @context are allowed in reverse property maps.

An invalid value for a reverse property has been detected. The value of an inverse property must be a node object.

An invalid value for an @reverse entry has been detected, i.e., the value was not a map.

The local context defined within a term definition is invalid.

A script element in HTML input which is the target of a fragment identifier does not have an appropriate type attribute.

A set object or list object with disallowed members has been detected.

An invalid term definition has been detected.

An @type entry in a term definition was encountered whose value could not be expanded to an IRI.

An invalid value for an @type entry has been detected, i.e., the value was neither a string nor an array of strings.

A typed value with an invalid type was detected.

A value object with disallowed entries has been detected.

An invalid value for the @value entry of a value object has been detected, i.e., it is neither a scalar nor null.

The @version entry was used in a context with an out of range value.

An invalid vocabulary mapping has been detected, i.e., it is neither an IRI nor null.

When compacting an IRI would result in an IRI which could be confused with a compact IRI (because its IRI scheme matches a term definition and it has no IRI authority).

A keyword redefinition has been detected.

The document could not be loaded or parsed as JSON.

There was a problem encountered loading a remote context.

Multiple HTTP Link Headers using the http://www.w3.org/ns/json-ld#context link relation have been detected.

An attempt was made to change the processing mode which is incompatible with the previous specified version.

An attempt was made to redefine a protected term.