Hi Here is the soltion to your problem. I opened the camera, take out all the screws, but make sure to make a notes where they cam from, beacuse they are not all the same size, so you don't want to mix them. After that open the camera (it will split on two parts). On the place where the main control buton is (you know (off, tape, manual and auto) there is the main conector (a plugin). Disconect it, wait for 1/2 hour and put it back again. It will do a hard reset of the camera, and the error message will be lost. You can assemble the camera back and turn it on. Everything should be OK. My camera is gr-d30U but probably everything will be same on yours. Always disconnect the battery from the camera when you are not using it, and also don't leave the tape when you are not using the camera. Also keep a lot of this small silicate gel bags in the camera bag. Hope this will help you, it helped me.

DO NOT ATTEMPT TO DISMANTLE OR USE ANY CLEANING SOLUTIONS INSIDE ANY JVC UNIT! If the device displays a Condensation error: 1. Open the tape compartment 2. Remove the tape 3. Keep the power ON (important) - if you do not the device "memory" will NOT clear itself 4. Wait approximately 5-10 min for the message to clear Read more below - the manufacturer is well aware of this condition and has designed these units to be "highly sensitive" to moisture build up. ============================================================================ If this device has been cooled down in a cold place and is then carried to a warm place, the moisture contained in the warm air may adhere to the head drum or tape guides and be cooled into water droplets. This phenomenon is referred to as condensation (dew). When this occurs, the head drum and tape guides are covered with droplets allowing the tape to be stuck to them, leading to tape damage. • Condensation occurs in the following cases: • When this device is suddenly moved from a cold place to a warm place. • When a room heater has just started or when this device is exposed directly to cold air from an air conditioner. • When this device is placed in a very humid place. • “CONDENSATION ON DRUM” is displayed on the LCD monitor and in the viewfinder when condensation occurs in this device. Keep the power on until the warning message disappears. If the power is turned off while the warning message is displayed, condensation may remain in the device even if the warning message is not displayed. Wait until this device is completely dry before using. • Pay attention to condensation even before the condensation indication appears. As condensation forms gradually, the condensation indication may not appear for the first 10-15 minutes after condensation has formed inside. In an extremely cold place, the condensation could freeze and turn into frost. In such a case, it takes an additional 2- 3 hours for the frost to first melt into condensation and then to be dissolved. • To prevent condensation When moving this device from one place to another where the temperatures are greatly deferent, first remove the videocassette, place this device in a tightly sealed vinyl bag, and then move it to a new environment. To ensure no condensation occurs, allow the temperature of this device in the bag to reach that of the new environment before using it.