Launcher refuses to launch minecraft 1.2-1.4

from 1.2.1 release

  Minecraft has crashed!      
  ----------------------      

Minecraft has stopped running because it encountered a problem.

--- BEGIN ERROR REPORT 7cf3a456 --------
Generated 7/31/25 8:26 PM

Minecraft: Minecraft 1.2.1
OS: Windows 10 (amd64) version 10.0
Java: 1.8.0_51, Oracle Corporation
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
LWJGL: 2.9.0
OpenGL: Intel(R) UHD Graphics version 4.6.0 - Build 30.0.101.2079, Intel

java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:97)
at adi.a(SourceFile:62)
at adi.a(SourceFile:99)
at net.minecraft.client.Minecraft.a(SourceFile:256)
at net.minecraft.client.Minecraft.run(SourceFile:650)
at java.lang.Thread.run(Thread.java:745)
--- END ERROR REPORT 332ae497 ----------

from 1.3 release

-- BEGIN ERROR REPORT 694c3cb6 --------
Generated 7/31/25 8:28 PM

• Minecraft Version: 1.3

• Operating System: Windows 10 (amd64) version 10.0

• Java Version: 1.8.0_51, Oracle Corporation

• Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation

• Memory: 153898392 bytes (146 MB) / 201326592 bytes (192 MB) up to 2147483648 bytes (2048 MB)

• JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M

• LWJGL: 2.9.0

• OpenGL: Intel(R) UHD Graphics GL version 4.6.0 - Build 30.0.101.2079, Intel

• Is Modded: Probably not

• Type: Client

• Profiler Position: N/A (disabled)

java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:97)
at ak.a(SourceFile:56)
at ak.a(SourceFile:91)
at net.minecraft.client.Minecraft.a(SourceFile:250)
at net.minecraft.client.Minecraft.run(SourceFile:516)
at java.lang.Thread.run(Thread.java:745)
--- END ERROR REPORT cc435289 ----------

Hey an Thanks for reporting!

I have acouple ideas

1. Update Java

2. Check your Logs

3. Allocate more memory

4. Reinstall MC

5. Check for Compatibility Mode

-Toucka (btw. im going on vacation this week so this will be my last Comment on a Bug Report for like 2 Weeks. Im worthy) Peace out!

We do not have enough information to find the cause of this issue.

Please attach the crash report found in minecraft/crash-reports/crash-<DATE>-client.txt here.
If you cannot find a crash report, please attach the full launcher log found in minecraft/launcher_log.txt.

This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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Thank you for your report!
However, this issue is Invalid

Your Minecraft version is outdated. We only take issues for the latest release and the latest snapshot.
Please update to the latest version as it includes the newest fixes. If you still have this problem after updating, then please create a new issue.
In case of a game crash, please also attach the crash report found in minecraft/crash-reports/crash-<DATE>-client.txt.

Quick Links:
📓 Bug Tracker Guidelines -- 💬 Community Support -- 📧 Mojang Support (Technical Issues) -- 📧 Microsoft Support (Account Issues) -- 📓 Project Summary -- ✍️ Feedback and Suggestions -- 📖 Game Wiki