RStudio 2026.01.1 crashes with exit code 3221225477 and json-parse error 11

RStudio IDE
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1

Hi everyone,

RStudio crashes immediately on startup with exit code 3221225477. Here's the full error report:

R Session Startup Failure Report

RStudio Version

RStudio 2026.01.1+403 "Apple Blossom " (0e924abb, 2026-02-04) for windows

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) RStudio/2026.01.1+403 Chrome/140.0.7339.249 Electron/38.7.2 Safari/537.36

Error message

[No error available]

Process Output

The R session exited with code 3221225477.

Error output:

[No errors emitted]

Standard output:

[No output emitted]

Logs

C:/Users/MYUSERNAME/AppData/Local/RStudio/log/rsession-ramey.log

2026-03-07T14:33:35.469320Z [rsession-MYUSERNAME] ERROR json-parse error 11 (An error occurred while parsing json. Offset: 4087); OCCURRED AT class rstudio::core::Error __cdecl rstudio::core::json::Value::parse(const char *) src/cpp/shared_core/json/Json.cpp:697; LOGGED FROM: void __cdecl rstudio::session::modules::r_packages::AsyncPackageInformationProcess::onCompleted(int) C:\\Users\\jenkins\\workspace\\ide-os-windows\\rel-mariposa-orchid\\src\\cpp\\session\\modules\\SessionAsyncPackageInformation.cpp:203
2026-03-07T14:33:35.469320Z [rsession-MYUSERNAME] ERROR json-parse error 11 (An error occurred while parsing json. Offset: 4087); OCCURRED AT class rstudio::core::Error __cdecl rstudio::core::json::Value::parse(const char *) src/cpp/shared_core/json/Json.cpp:697; LOGGED FROM: void __cdecl rstudio::session::modules::r_packages::AsyncPackageInformationProcess::onCompleted(int) C:\\Users\\jenkins\\workspace\\ide-os-windows\\rel-mariposa-orchid\\src\\cpp\\session\\modules\\SessionAsyncPackageInformation.cpp:203

What I've tried so far:

  • R console (RGui) works fine outside RStudio
  • Reinstall RStudio

System info:

  • Windows 11
  • R version: R 4.5.2

Any help would be appreciated!

Thanks!

2

Have you tried resetting RStudio's state? (Reinstalling RStudio does not do this.)

3

Thanks! Yes, I deleted %localappdata%\RStudio folder completely and RStudio works fine now.

The json-parse error was from corrupted package cache in that folder. Fixed!