After updating to 1.1.0, PlatformIO has begun to throwing this error. What is the solution to this problem? I can upload project files if requested.

Please run in PlatformIO Terminal:
pio platforms list
And then delete all platforms
pio platforms uninstall platform1 paltformN
I received Error: Unknown platform 'platform1'.
Of course you will receive it. It was an example. Please run pio platforms list and then delete all platforms listed in this command. For example (real), pio platforms uninstall atmelavr. Then try to build project.
Hahaha sorry, my mistake :smile: I ran pio platforms uninstall atmelavr. After I hit compile, PlatformIO redownloaded atmelavr. Now it works properly. Thanks!
Happy Coding! :smile:
Please give a star :star: for our repositories:
Thanks!