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Persistent Companion Error: "java.lang.String.equals(java.lang.Object)' on a null object reference"
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2
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39
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June 5, 2026
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Build Error : App Inventor is unable to compile this project
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4
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70
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April 22, 2026
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Error Code 4200 403
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0
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34
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April 8, 2026
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FAQ Section: Build Errors
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0
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4616
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January 1, 2020
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( Get Device ID) Why Show me Error
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5
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277
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September 15, 2025
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Error message is "The operation + cannot accept the arguments: , ["ot Fo"], [1]"
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15
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1010
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August 20, 2025
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Mit App Inventor Page cannot be dragged in Chrome Browser
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5
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342
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August 8, 2025
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Error 2101 file not found
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4
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691
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July 7, 2025
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Error from Companion: edu.mit.appinventor.aicompanion3: One of RECEIVER_EXPORTED or RECEIVER_NOT_EXPORTED should be specified when a receiver isn't being registered exclusively for system broadcasts
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4
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441
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July 4, 2025
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Build for iOS: Getting Error - Failed to sign
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3
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805
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July 4, 2025
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“err_unknown_url_scheme” error when using WebViewer
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3
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3265
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June 10, 2025
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App inventor error 4200 : error from to chatbot code ; -1 fix
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4
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1184
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February 2, 2025
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Cause of error during output
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5
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446
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January 1, 2025
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Generating icons... Task errored generating android APK
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7
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763
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December 25, 2024
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Error occurs after running ant command when trying to run app inventor locally
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1
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488
|
December 12, 2024
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Error 703 unable to play sound
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7
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2546
|
December 10, 2024
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Select list item: List index too large
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19
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1867
|
December 2, 2024
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How do I fix this error code?
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2
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485
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September 29, 2024
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Bad arguments lookup in pairs The operation lookup in pairs cannot accept the arguments ["field1"],[3494],["not found".]
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7
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1033
|
August 29, 2024
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APK Build failed
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1
|
637
|
August 29, 2024
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Error from companion
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6
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916
|
August 27, 2024
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Appinventor (ai2) is bugging so much that it broke my app
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7
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771
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July 31, 2024
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Facing issue with Cloud DB
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8
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1039
|
July 15, 2024
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Server error: could not retrieve project information. Please try again later!
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7
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1114
|
July 20, 2024
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Error from Companion: register failed, the sensor listeners size has exceeded the maximum limit 128"
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0
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844
|
June 26, 2024
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An internal error has occurred when I try to open the project. Help me
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5
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636
|
June 24, 2024
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Compilation Error, Can't find class file for screen
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6
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3203
|
June 13, 2024
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Necesito ayuda para recibir datos y filtrar 18 datos numericos desde modulo HC 06
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11
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5668
|
June 13, 2024
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Error during compile (caught exception in inline compiler)
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3
|
778
|
June 1, 2024
|
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My progress was deleted and I don't know how to get it back
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1
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710
|
May 31, 2024
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