UEFN material instance and getting an error report. then I made a mistakes I dont know how to fix

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Summary

guys ive been working on a map and i created a new material instance for the landscape. and it kept giving me an error every time i tried to push changes so i followed the error log and located it in the file path in fortnite projects and i deleted it. saved the file and tried to go back on my project and it keeps crashing. i launch other maps and it worked fine but everytime i tried to launch the map i made the material it keeps crashing. i went back into the file and added back what i deleted hoping i can get back on the map and just use a normal landscape material but it still keeps crashing.. does anyone know a fix to this or what i can do? any help or advice would be nice because ive spend endless hours building the map and decide to change the landscape paint last minute before publishing and i really dont want to lose a map because i made a mistake..

Steps to Reproduce

go to UEFN and under fortnite > landscape > material > create material instance. right click and make one or 2 in different layers. pushing changes give me an error that says
/Game/Athena/Environments/Landscape/Textures/T_Athena_Snow_01_M is the problem and a file path to find it, i found it in my documents under fortnite projects, opened up the folder, went to CustomLandscapeMaterial (what i named it) then i deleted /Game/Athena/Environments/Landscape/Textures/T_Athena_Snow_01_M from the file. reopened UEFN and launch my project and it keeps giving me a crash report. I went back to the file and put back in /Game/Athena/Environments/Landscape/Textures/T_Athena_Snow_01_M where it should be, saved the file again and launched a session and it keeps giving me the same crash report and I genuinely dont know how to fix it… im scared of losing my map because i put so much effort and endless hours into it and decide to change the landscape last second before publishing it…

Expected Result

when u launch the map it keeps giving a crash report. other projects loads fine but the one u deleted /Game/Athena/Environments/Landscape/Textures/T_Athena_Snow_01_M from in fortnite projects wont launch

Observed Result

It wont work and from the bottom of my heart i’d genuinely love if someone can help me fix this please…

Platform(s)

PC

Island Code

the map is not published.. I was going to published it later after I paint the landscape but now I cant even get back on the map..

Additional Notes

any help to fix this will be highly appreciated… from anyone.. please.. thank u in advance <3 God bless