No enclosing ref (owner pTN) of Attr in UTOwnerOfAttr.

No Unode Corresponds to Attr in UTOwnerOfAttr.

NIL passed in to UTOwnerOfAttr.

No ref node above the start node in UTTextify.

Startnode passed to UTTextify was NIL.

No unode corresponds to the node in UTSizeScene.

No unode corresponds to the node in UTsizenode.

An already deactived scene was passed to UTdeactivate.

Nil passed in to UTdeactivate.

An already active scene was passed to UTactivate.

NIL passed in to UTactivate.

Illegal nodes passed to UTrectnode.

Bad params passed to UTgoforward.

Bad params passed to UTgoback.

Could not find a ref node in UTseekline.

Unused.

NIL Unode was passed to UTFocbelow.

NIL Unode passed to UTwhere.

Not at a reference node in UTclosest.

NIL Unode passed to UTClosest.

No reference node above the starting point in UTGenLines.

NIL startnode passed to UTGenLines.

Trying to turn off a required/user new line in UTSetNLs.

Bad Unode found in UTAmtLeft.

Scanned an illegal node in UTDoFill.

An environment in Fit has no son.

A root node was found in Fit.

NIL Unode passed into Fit.

NIL passed into SceneOf

Propagate received a NIL unode.

An Environment has no son in Measure.

UEmodify failed in Measure

Found a root to resolve in Measure.

Unode passed to Measure was NIL.

Scene passed to UTresolve does not exist.

One of the replace nodes is NIL in UTReplace.

Trying to linkleft with a NIL node.

Trying to link with a NIL node.

Previous node for an end environment in UTBuild is not an environment node.

No previous environment for an end environment in UTBuild.

Previous component for an end component in UTBuild is not a ref-node.

No previous component for an end component in UTBuild.

Tried to build an optional component in UTBuild.

Bad state of build in UTBuild.

UTbuildcursor OR UTbuildscene is set to NIL in UTBuild.

Could not find a root above the node passed to UTSetBuild.

An empty node was passed to UTSetBuild.

Calling UTGetView on a non-ref node.

Calling UT1stref on non root node.

Trying to reset a non-root in UTreset.

UTfree was passed a NIL node.

Bad root chain noticed in UTfreeRoot.

A non root was passed to UTfreeRoot.

Ref Node not found in the chain passed to UTrmreffromchain.

A non ref-node was passed to UTrmreffromchain.

Not at a reference node in UTdellistelement.

Internal error found in the UTree module.