Invalid line constraints in Tranformation.

[thdawkins]

Hi, not really a help question, but when I use transform in lightroom classic, mainly using the upright guides, I get an Invalid Line constraint warning.  Can someone advise me what this means? 

What I was doing is trying to straighten up the vertical line on a high rise building.  I chose two clearly defined vertical lines.   I have some assumptions, but I would like to know for sure so I know how to correct it.

My first assumption is that my image was not taken correctly for the guided uprights to function properly.

My next assumption is the Starting point of the line was too close to the ending point and that it needed to be wider apart from one another.

Any assistance with this would be much appreciated.

[Jao vdL]

Can you show a screenshot of how you're trying to apply the upright lines or share the file you're trying to correct? Usually this happens when the lines you add would result in a very large correction, so just moving them around a bit might fix it.