When I run .\gradlew genIntellijRuns in windows powershell on the mod folder, it returns:

'DMod\' is not recognized as an internal or external command,
operable program or batch file.
Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain

Well, I don't know what using Command Prompt vs Powershell did, but it appears to work now. I'll bring it up again if I get the error again. output log:

 

C:\Users\Caleb Chervenka\Documents\Forge+Java\1.15.2>gradlew genIntellijRuns
To honour the JVM settings for this build a new JVM will be forked. Please consider using the daemon: https://docs.gradle.org/4.9/userguide/gradle_daemon.html.
Daemon will be stopped at the end of the build stopping after processing

> Configure project :
New Dep: net.minecraftforge:forge:1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/4.9/userguide/command_line_interface.html#sec:command_line_warnings

BUILD SUCCESSFUL in 15s
8 actionable tasks: 8 executed
C:\Users\Caleb Chervenka\Documents\Forge+Java\1.15.2>