Missing RevitAPI.dll after update ?!

[mr.engineer.aec]

 Hi guy,

 In Revit 2023, we have some API to update.

 Before, i use RevitAPI 2020 in my project.

 Now, i want to change RevitAPI 2023 in my project: i deleted RevitAPI 2020 in reference and add RevitAPI 2023 and rebuild.

 But after that, i missing reference like pic, in spite of in code, i don't have error.

 How can i solved this issue ?

 Thank in advanced !

[sahin.ikbal · Accepted solution]

I think this problem is happening because you are working on a older .Net framework version.

Go to project's property then build option from there change the .Net framework version to 4.8, it will most probably solve your problem.

[mr.engineer.aec]

Thank bro,
that's right!