Random Errors

This site is a place where I document the solutions for the random problems and errors I encounter when writing code or learning new technologies. For most of the topics listed below, I created the article only after completing an extensive Internet search for a solution, but couldn't find one, before finally figuring it out myself. The site currently has 38 posts.

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I was playing around with my JMW Demos site the other day and noticed that when I clicked the Call Cloud Function button on the page that the code executed twice.

I run Microsoft's Java on my development system and whenever I upgrade Java on my system, it breaks my Flutter toolchain. Here's what it looks like.

I'm doing some Arduino development for a friend, helping him build a throttle gauge for his race car. For this project I have a string of NeoPixels and I'm trying to figure out how many of them to illuminate based on the car's throttle position. Whenever I calculate the value, the result is always zero. Here's the code:

I was working on an Arduino project that connected to a server to retrieve some information. As I tested an initial version of the sketch, I noticed that the connection worked, but returned a 301 error.

For years now, the Particle Platform on login prompted me to enable two factor authentication (2FA). I finally got tired of seeing that message, so last week I enabled 2FA on my account.

I was working in an old React app today and came across the following error at runtime:

I recently migrated several Eleventy v2 sites to Eleventy v3 on node.js 22; I wrote about the process in Eleventy 3 Migration. During the migration process, I made a change to the site that generated the following error:

I created a new node.js-based command-line utility this week (@johnwargo/link-checker) and since I knew there was already a package there with that name (link-checker) I knew I had to publish the package in such a way that a user could publish it and use my npm account name (@johnwargo) to install my version of the utility.

I created a new node.js-based command-line utility this week (@johnwargo/link-checker) and when I first tested the utility after publishing it, something weird happened. Rather than launch the utility as I expected, the node.js package's source code file opened in the default JavaScript editor on my Windows system.

I'm working on a project that uses the Beetle ESP32 - C3 (RISC-V Core Development Board) and I noticed in my testing that the device wasn't sending any output to the Arduino IDE Serial Monitor.

When running an application that requires elevated access (admin privileges) in the Delphi IDE (RAD Studio), you may see an error displayed in a dialog that says "Unable to create process: The requested operation requires elevation." as shown below:

A few weeks back, in terminal windows (command prompts) on my primary Windows system, the system lost access to the system PATH variable contents. My experience differed depending on how I launched the terminal window.

I added the Music Maker FeatherWing to a ESP32 Feather V2 device and I’m following the instructions in the tutorial to run the feather_player sample sketch. I put some music files on the memory card, inserted it in the memory card holder then changed the file names in the sketch so it plays the sound files I have on the memory card.

After sorting out how to deploy code to an ESP32 device that runs different code on each processor core, I set about building out my application. As soon as I added my project's code to one of the cores, the device started rebooting again when it ran the code and generated the following error message:

I built several projects on the ESP32 platform over the last few years; I recently published an update to my Glowing Pumpkin project. The project basically randomly flashes some LEDs with the intention that you put it inside a carved pumpkin and it does cool light effects inside the pumpkin. I wanted to build a version that used web application to control which color displays on the device so I set about learning how to run two processes on the processor, one that handles the LED stuff and the other that runs a web server accepting color requests from a remote device like a smartphone or tabled.

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