Hi,
While working on bw transport we need to follow certain sequence.
Have you followed that?
What objects you collected into TR?
What objects are exist at target system?
Never collect whole data flow into one TR.
Try to collect obejcts into each TR and avoing getting issues like above.
As per the above error can you check your dtp was collected into TR or not.
AS my guess your dtp will be in $tmp package,
So please check and change package to custom one and later collect into new TR.
TR - Transport Request.
Thanks