ElementException
Node with identifier $id does not exist
Edge with identifier $id does not exist
Source node with identifier $source does not exist
Target node with identifier $target does not exist
Edge between nodes $source and $target does not exist

IdentifierException
Invalid node identifier $id requested
Non-successive node identifier $id requested
Invalid edge identifier $id requested
Non-successive edge identifier $id requested

ConflictException
Node with identifier $id already exists
Edge with identifier $id already exists
Edge between nodes $source and $target already exists

MemoryException
Unavailable memory for a new node in the nodes container
Unavailable memory for a new edge in the edges container
Unavailable memory for the adjacency matrix extension
Unavailable memory for constructing a source graph copy
Unavailable memory for assigning a source graph copy

FileException
Unable to open output file $filename
Unable to open input file $filename