ArmA.RPT file is the debug report file created by the game engine when its running. Sometimes if you have alot of errors in addons, islands or missions this file gets excessively large (several megabytes in fact). However it is a valuable tool for editing as it reports errors in so much detail.

w:\c\Poseidon\lib\roads.cpp(51) : Road object not present
Cause: (something to do with usermade island ca\roads\ces* roads) ?
Fix: ?

Tree at 85096.398, 5950.000 out of grid (z-axis) - 0.000 rounded to 2
Cause: ?
Fix: ?

Are these below two the same error or completely different ones?

Object id 9f674957 (343) not found in slot 233,251
w:\c\Poseidon\lib\landSave.cpp(1692) : Link cannot be resolved
Cause: ?
Fix: ?

Warning Message: Cannot open object <addon>\<model>.p3d
Cause: object not found in addons dirs.
Fix: remove object or add the addon.

Warning Message: Cannot load texture <addon>\<filename>.ext
Cause: Texture not found?
Fix: Add the missing texture.

w:\c\Poseidon\lib\pactext.cpp(1823) : Obsolette P8 format
Obsolete palette format texture
Cause: ?
Fix: ?

Warnings in <addon>\<model>.p3d:3
Point 92: Invalid point flags ffffcc00.
Cause: ?
Fix: ?

Warnings in <addon>\<model>.p3d:9
Key frame animation, no 'keyframe' property
Cause: ?
Fix: ?

Warnings in <addon>\<model>.p3d:1
Face 211, point 207, face points 206,207,209 - invalid normal 1.#QNAN,1.#QNAN,1.#QNAN
Cause: ?
Fix: ?

In Vehicle: <addon>\<model>.p3d missing gunner get in direction point
In Vehicle: <addon>\<model>.p3d missing driver get in direction point
Cause: point missing in Memory LOD.
Fix: add gunner/driver/etc memory point in the Memory LOD.

Error: bin\config.bin/CfgVehicles/<name>/Turrets/MainTurret/Turrets/CommanderOptics/: Turret gun obsGun not found while initializing the model <addon>\<model>.p3d
Cause: ?
Fix: ?

<addon>\<model>.p3d:30: Bad proxy object definition proxy:<proxy_name> Cause: ? Fix: ?

Warning Message: No entry 'bin\config.bin/CfgModels/Default.sections'.
Warning Message: Size: '/' not an array
Cause: ?
Fix: ?

Warning Message: No entry 'bin\config.bin/CfgModels/Default.sectionsInherit'.
Warning Message: '/' is not a value
Cause: ?
Fix: ?

Warning: <addon>\<model>.p3d:0 Face 1500, point 1495, face points 1495,1496,1494 - very small normal 0,0,0
Cause: ?
Fix: ?

No shape object 2: <no shape> tested for aiming position
Cause: ?
Fix: ?

<addon>\<model>.p3d: house, config class missing
Cause: ?
Fix: ?

Warning: Pixel shader Detail not supported for roads.
Cause: ?
Fix: ?

w:\c\Poseidon\lib\AI\operMap.cpp(2131) : Cannot search path - no algorithm
Cause: ?
Fix: ?

No point in selection zamerny.
Cause: ?
Fix: ?

Conflicting addon <addon> in '<addon>\', previous definition in '<addon>\'
Cause: Two addons use the same classname.
Fix: Use individual classnames.

w:\c\Poseidon\lib\shots.cpp(45) : No shape
Cannot load sound 'sound\soundfly1.wss'
Cause: ?
Fix: ?

Warning: <addon>\<model>.p3d:0 Error while trying to generate ST for points: 5823, 5765, 5792
Cause: ?
Fix: ?

Missing axis in model <addon>\<model>.p3d:0, sel trigger, axis trigger_axis
Cause: ?
Fix: ?

Warnings in <addon>\<model>.p3d:0
Warning Message: Bad file format ().
Cause: ?
Fix: ?

Degenerate face - 0 vertices
Cause: ?
Fix: ?

Warning: <addon>\<model>.p3d: Degenerated triangle found on source triangles (136,139,138)
Cause: ?
Fix: ?

Warning: Degenerated faces found in model <addon>\<model>.p3d:10000
Cause: ?
Fix: ?

Error: Bad entry count in bin\config.bin/CfgSkeletons/<name>/ skeleton
Cause: ?
Fix: ?

Strange convex component <addon>\<model>.p3d in component01:geometry
Cause: ?
Fix: ?

w:\c\Poseidon\lib\Shape\material.cpp(1683) : Unknown terrain pixel shader during conversion to grass
w:\c\Poseidon\lib\landscape.cpp(965) : Unknown terrain material
Cause: one possible cause is wrong path/texture in .rvmat file.
Fix: fix the path/texture.

Warnings in <addon>\<model>.p3d:0
Warning Message: Error loading tag
Cause: ?
Fix: ?

Invalid named selection map
Invalid named selection class
Invalid named selection dammage
Invalid named selection canocclude
Invalid named selection (its just empty, no name at all).
Cause: ?
Fix: ?

<addon>\<model>.p3d - Not all levels have On Surface set
Cause: On Surface set is not selected on some of the LODs.
Fix: Check all LODs carefully for this setting.

SW animation used for <model>\<model>.p3d - Not all levels have Keep Height set
Cause: Keep Height is not selected on some of the LODs.
Fix: Check all LODs carefully for this setting.

In Vehicle: <addon>\<model>.p3d missing driver get in direction point
Cause: no driver get in point at Memory LOD.
Fix: add point to the Memory LOD.

Warning: UV coordinate on point 256 is too big UV(153.364182, 0.999795) - the UV compression may produce inaccurate results
Cause: ?
Fix: ?

Unrecognized texture type ': '<addon>'
Cause: ?
Fix: ?

Warning: Object is animated, but no skeleton is defined
Cause: ?
Fix: ?

Error: <addon>\<model>.p3d: Shadow polygon doesn't have 3 vertices - it has not been considered.
Cause: ?
Fix: ?

Error: w:\c\Poseidon\lib\d3d9\engdd9.cpp(11570) : Unknown type of vertex shader
Cause: ?
Fix: ?

Error: Empty word in sentence 'xmit'
Cause: This will happen if you have an AI controlled M1Abrams on the map (at map start).
Fix: heh.

Error: Warning Message: 'value/' is not a class ('oid' accessed)
Cause: ?
Fix: ?

Error: Missing 'stats' in campaign campaigns\ra
Cause: ?
Fix: ?

Error: Wrong vertex mapping for person collision geometry found in <addon>\<model>.p3d. Selection <name> not found
Cause: ?
Fix: ?

Error: Wrong geometry convex component mapping for person collision geometry found in <addon>\<model>.p3d. Convex component number <number>. not found
Cause: ?
Fix: ?

Error: Addon <addon> (entry <classname>) not found in the list of active addons.
Cause: ?
Fix: ?

Error: w:\c\Poseidon\lib\d3d9\engdd9.cpp(2989) : 2nd UV set needed, but not defined
Cause: ?
Fix: ?

Error: w:\c\Poseidon\lib\soldierOld.cpp(7398) : Face
Cause: ?
Fix: ?

Error: Empty word in sentence 'allGroup' 'moveTo' 'that' 'at' 'at12' 'xmit'
Cause: ?
Fix: ?

Error: w:\c\Poseidon\lib\visibility.cpp(294) : BUG: Adding in-vehicle target.
Cause: ?
Fix: ?

Error: w:\c\El\ParamFile\paramFile.cpp(2858) : No owner
Cause: ?
Fix: ?

Error: Bad lock radius 58.4023
Cause: ?
Fix: ?

Error: Too detailed shadow lod in <addon>\<model>.p3d (0:1.000000 : 5570) - shadows disabled
Cause: Most likely shadowVolume AND LodNoShadow=1 settings missing.
Fix: Add shadowVolume and/or proper LodNoShadow setting.

Error: Model <addon>\<model>.p3d cannot be used as a sprite - it has not just one LOD level
Cause: ?
Fix: ?

LODShape::Preload: shape '<addon>\<model>.p3d' not found
Cause: ?
Fix: ?

Warning: <addon>\<model>.p3d: Selection <selection> needs a section. The shadow volume may not work well.
Cause: ?
Fix: ?

Unknown ammo used.
Cause: ?
Fix: ?