DFU begin
dyld: Library not loaded: /opt/local/lib/libusb-1.0.0.dylib
DFU end
Referenced from: /Users/x/Library/Arduino15/packages/SeeedJP/tools/stm32_dfu_upload_tool/1.0.0/macosx/dfu-util/dfu-util
Reason: image not found
/Users/eiichirho/Library/Arduino15/packages/SeeedJP/tools/stm32_dfu_upload_tool/1.0.0/macosx/dfu_upload: line 5: 15607 Abort trap: 6 $(dirname $0)/dfu-util/dfu-util -d $2 -a $1 -D $3 -s $4 -R

Downloading packages
SeeedJP:[email protected]
Installing platform SeeedJP:[email protected]
Failed to install platform: SeeedJP:stm32.
Error: 13 INTERNAL: Cannot install platform: installing platform SeeedJP:[email protected]: searching package root dir: no unique root dir in archive, found 'C:\Users\takashi\AppData\Local\arduino15\tmp\package-349504246\cores' and 'C:\Users\takashi\AppData\Local\arduino15\tmp\package-349504246\libraries'

#include <Wire.h>

#define I2C_ADDR  2

byte x = 0;

void setup()
{
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
}

void loop()
{
//  Serial.println(11111);
//  Wire.requestFrom(I2C_ADDR, 6);  // request 6 bytes from slave device
//
//  while(Wire.available())         // slave may send less than requested
//  {
//    char c = Wire.read();         // receive a byte as character
//    Serial.print(c);              // print the character
//  }
//  Serial.println();
  delay(10);

  Wire.beginTransmission(I2C_ADDR); // transmit to device
  Wire.write("x is ");              // sends five bytes
  Wire.write(x);                    // sends one byte
  Wire.endTransmission();           // stop transmitting
  x++;

  delay(500);
}

#include <WioCellLibforArduino.h> 

#define I2C_ADDR  2

void setup()
{
  Wire.begin(I2C_ADDR);         // join i2c bus with address SeeedJP/SeeedJP_STM32F4#4
  Wire.onRequest(requestEvent); // register event
  Wire.onReceive(receiveEvent); // register event
  SerialUSB.begin(9600);           // start serial for output
}

void loop()
{
  delay(90);
  SerialUSB.println(111111);  
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
{
  while(1 < Wire.available()) // loop through all but the last
  {
    char c = Wire.read();     // receive byte as a character
   SerialUSB.printf("%c",c);          // print the character
  }
  int x = Wire.read();        // receive byte as an integer
  SerialUSB.printf("%d\n",x);        // print the integer
}
//
// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
  delay(50);
  Wire.write("hello\n");  // respond with message of 6 bytes
                          // as expected by master
}

CRCが一致しません。ファイルが壊れています。一時的な問題かもしれませんので、もう一度試してみてください。
java.lang.RuntimeException: java.lang.Exception: CRCが一致しません。ファイルが壊れています。一時的な問題かもしれませんので、もう一度試してみてください。
	at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onInstallPressed$2(ContributionManagerUI.java:175)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.Exception: CRCが一致しません。ファイルが壊れています。一時的な問題かもしれませんので、もう一度試してみてください。
	at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:105)
	at cc.arduino.contributions.DownloadableContributionsDownloader.download(DownloadableContributionsDownloader.java:60)
	at cc.arduino.contributions.packages.ContributionInstaller.install(ContributionInstaller.java:113)
	at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onInstallPressed$2(ContributionManagerUI.java:172)
	... 1 more

--- a/package_SeeedJP_index.json
+++ b/package_SeeedJP_index.json
@@ -776,15 +776,15 @@
               "host": "i686-linux-gnu",
               "url": "https://azureboard.blob.core.windows.net/toolchain/openocd-0.10.0.zip",
               "archiveFileName": "openocd-0.10.0.zip",
-              "checksum": "MD5:3648e4cd6af88ae4e3a59e068723a1d7",
-              "size": "10406262"
+              "checksum": "MD5:e2b41d2279b08fb002ecfd13c8764725",
+              "size": "2784537"
             },
             {
               "host": "x86_64-pc-linux-gnu",
               "url": "https://azureboard.blob.core.windows.net/toolchain/openocd-0.10.0.zip",
               "archiveFileName": "openocd-0.10.0.zip",
-              "checksum": "MD5:3648e4cd6af88ae4e3a59e068723a1d7",
-              "size": "10406262"
+              "checksum": "MD5:e2b41d2279b08fb002ecfd13c8764725",
+              "size": "2784537"
             },
             {
               "host": "i686-mingw32",