Undeclared Identifier

The compiler saw a name it does not recognise.

Expected End of Line

Something followed a complete statement before the newline — usually a stray token the parser cannot interpret.

Expression Statement Has No Effect

An expression at script scope that doesn't do anything — a bare identifier, a bare arithmetic expression, a function call whose return is thrown away.

Drawing-Object Caps

The script tried to create more lines / labels / boxes / polylines than its declaration allows.

Compute Budget Exceeded

A computation ran past its wall-clock budget (2 s per live tick, 10 s for a full recompute). What the budgets are, how pacing avoids the error, and the usual causes.