Fixes IOFleException by correcting the file path

[Shotsphere]

No description provided.

[hollasch]

Thanks for coming back on this! I'm annoyed by the misspelled FILE_SEPERATOR, and its lack of need (not your fault). Also, the path construction could be simpler. Can you try the following changes to see if this addresses your problem?

diff --git a/src/forge/production/lib/gradle/start/GradleStart.java b/src/forge/production/lib/gradle/start/GradleStart.java
index f6b7679..707b8a9 100644
--- a/src/forge/production/lib/gradle/start/GradleStart.java
+++ b/src/forge/production/lib/gradle/start/GradleStart.java
@@ -34,7 +34,6 @@ import net.minecraftforge.gradle.OldPropertyMapSerializer;
 
 public class GradleStart extends GradleStartCommon {
 
-      private static final String FILE_SEPERATOR = File.separator;
       private static final Gson GSON;
 
       public GradleStart() {
@@ -58,7 +57,8 @@ public class GradleStart extends GradleStartCommon {
       protected void setDefaultArguments(Map<String, String> argumentMap) {
             argumentMap.put("version", "1.7.10");
             argumentMap.put("assetIndex", "1.7.10");
-            argumentMap.put("assetsDir", new File("").getAbsolutePath() + FILE_SEPERATOR + "lib" + FILE_SEPERATOR + "gradle" + FILE_SEPERATOR + "assets");
+            argumentMap.put("assetsDir", String.join(File.separator, new File("").getAbsolutePath(),
+                "Minecraft", "production", "lib", "gradle", "assets");
             argumentMap.put("accessToken", "FML");
             argumentMap.put("userProperties", "{}");
             argumentMap.put("username", null);
@@ -78,7 +78,8 @@ public class GradleStart extends GradleStartCommon {
 
       private static void hackNatives() {
             String libraryPath = System.getProperty("java.library.path");
-            String libraryLocation = new File("").getAbsolutePath() + FILE_SEPERATOR + "lib" + FILE_SEPERATOR + "gradle" + FILE_SEPERATOR + "natives";
+            String libraryLocation = String.join(File.separator, new File("").getAbsolutePath(),
+                "lib", "gradle", "natives");
             if(Strings.isNullOrEmpty(libraryPath)) {
                   libraryPath = libraryLocation;
             } else {