[galaxy-user] Cannot get rid of custom build error

Hello,

I've tried to create a custom build (starting from the trackster page) and clearly made some mistake. I get a NoConverterException error which is almost certainly my fault putting something wrong in. However, now the Custom Builds page shows this error and I cannot make it go away.

I have a local install, have killed and restarted, logged in and out, but still this error stays. I cannot try to enter another custom build because there is nothing on the page except this error. Does anyone kow how to get rid of this? Any help in getting around this error are appreciated.

Jim