Error: "Data layout for script 'blank.blank' has changed. Need to do a complete player export"?

I am using 2019.1.3f1, and recently updated one asset. And now when I try to build to exe I get an error:

"Error building scripts: Data layout for script 'RootMotion.FinalIK.TwistRelaxer' has changed. Need to do a complete player export"

I spent a while searching for answers. And only one relevant result shows on Google, and it is in Japanese!

I am at a loss how to proceed.

What does it mean?
Why did it happen?
How do i get rid of it???

Thanks for help!

[edit]
Here's more stacktrace:

Spoiler: stacktrace

UnityEditor.BuildPlayerWindow+BuildMethodException: Error building scripts: Data layout for script 'RootMotion.FinalIK.TwistRelaxer' has changed. Need to do a complete player export

at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x00242] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:194

at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x0007f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:97
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

[Solved]
Just uncheck the "scripts only build" checkbox for initial builds - I believe I forgot it was on, and that error message was far from specific.

maybe it should read:

"Error building scripts: Data layout for script 'RootMotion.FinalIK.TwistRelaxer' has changed. Need to do a complete player export but you have selected to "only build scripts" in the build settings"

 

Got the same error and solved the same way. The error message needs to be more clear I guess.

 

yaya.. yep ^

 

Thanks @trappist-1 I've got the same issue

 

I got it too.
Error information is not informative..

 

And no Unity response/fix for such critical debug information for over half a year :|

 

I was getting this error on Unity 2022.2.4f1, and the solution above did not work because there is no checkbox in the build settings for "scripts only build".

I solved by clicking the dropdown arrow next to the Build button at the bottom, then selecting Clean Build