Runtime Error: Object does not exist

Blitz3D Forums/Blitz3D Programming/Runtime Error: Object does not exist

UncleLag (Posted 2003) [#1]

I'm sure I'm missing something obvious, bur I just can't work out what it is. When I try to run my program a Runtime Error dialog is displayed with the message "Object does not exist". It highlights the following line of code: planet.ssb\xposTemp# = planet.ssb\xposTemp# - xvelTemp#. Here is the code in context: Type ssb Field name$ Field ID Field mass# Field radius# Field xpos#,ypos#,zpos# Field xposTemp# Field yposTemp# Field zposTemp# Field xvel#,yvel#,zvel# ; Field xvelTemp#,yvelTemp#,zvelTemp# Field entity End Type ...code deleted... For planet.ssb = Each ssb planet.ssb\xposTemp# = planet.ssb\xpos# planet.ssb\yposTemp# = planet.ssb\ypos# planet.ssb\zposTemp# = planet.ssb\zpos# xvelTemp# = planet.ssb\xvel# yvelTemp# = planet.ssb\yvel# zvelTemp# = planet.ssb\zvel# IDTemp = planet.ssb\ID For planet.ssb = Each ssb If IDTemp <> planet\ID Then ;we don't want to include the planet's effect on itself xvelTemp# = xvelTemp# + ((G * planet\mass)/((planet.ssb\xpos# - xposTemp#)^2)) ;remember to confirm if yvelTemp# = yvelTemp# + ((G * planet\mass)/((planet.ssb\ypos# - yposTemp#)^2)) ;squaring is slower than zvelTemp# = zvelTemp# + ((G * planet\mass)/((planet.ssb\zpos# - zposTemp#)^2)) ;multiplying together End If Next ;we will use the Temps to store information, otherwise the results for ;the next planet will be skewed/screwed by the results from the previous calculations planet.ssb\xposTemp# = planet.ssb\xposTemp# - xvelTemp# planet.ssb\yposTemp# = planet.ssb\yposTemp# - yvelTemp# planet.ssb\zposTemp# = planet.ssb\zposTemp# - zvelTemp# planet.ssb\xvel# = xvelTemp# planet.ssb\yvel# = yvelTemp# planet.ssb\zvel# = zvelTemp# Next ;now we can finalise the results. For planet.ssb = Each ssb planet.ssb\xpos# = planet.ssb\xposTemp# planet.ssb\ypos# = planet.ssb\yposTemp# planet.ssb\zpos# = planet.ssb\zposTemp# PositionEntity planet\entity,planet\xpos#,planet\ypos#,planet\zpos# Next

Skysaw (Posted 2003) [#2]

Could be that you're using the same identifier within two nested loops: For planet.ssb = Each ssb ... For planet.ssb = Each ssb ... next next There's no way to distinguish the two planet variables. At the very least, change one of them so you can tell which is the problem.