I spent hours trying to fix this and finally came to the solution. Clearing the market cache and removing your Google account must be done concurrently. If all else fails, remove your Google account, clear the cache for the market, and clear all cache and data from all applications and services that use the market icon. This is kind of like hunting a rabbit with a bazooka, but it'll git'er done.
To re-hash concisely:
Be aware: if steps 1, 2, and 3 don't work, step 4 can solve your problem ( it did for me ), but it may cause adverse effects or problems ( I'm not sure ).
1) Go to settings --> Account & Sync --> Click your Google account --> and click remove in the upper right hand corner of the screen.
2) Go to settings --> Applications --> Manage Applications --> Click the "All Applications" tab --> and then scroll until you find "Market". Choose "Clear Data".
3) Make another attempt to download or purchase an app.
If you still receive the error message:
4) Repeat steps 1 & 2 , but in addition to clearing the market cache ( which happens in step 2 ), look for any applications that seem related to the market ( there were multiple services and programs I found ) and clear the data/cache for all of them. When this step is completed, your tablet will reinitialize upon exit. You may receive a notification or error.
5) Restart your tablet, click the market, and you will be prompted to add a Google account. Sign in and accept the terms!!!
Hope this works!
cheers mate. I did steps 1,2 and 3 and market is working fine again
settings- privacy- factory data reset. then when it reboots wipe data for market. it's been working for me so far for a few hours. it hasn't updated to google play store yet tho, i don't know why and don't care as long as i can download apps.
I periodically have the Google Play Store get stuck on "Installing..." when I try to install an app (JellyBean, different tablet tho). I've done Clear Data for it & the Google Play Services as suggested above. But what I also needed to do was Clear Data on Media Storage. I have a large (~40GB) side-loaded MP3 collection, and the media crawler sometimes gets bogged down causing problems for everything (including Camera, which is apparently connected to Gallery, which apparently uses the media crawler). Of course, after you do this you will need to be patient (and perhaps reboot?) while it re-indexes your media.
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