ok, as it turns out, the error resides in these guns:
<Weapon Name="Teslagun">
<DisplayName>Tesla Gun I</DisplayName>
<Class>B</Class>
<Type>4</Type>
<Size>10</Size>
<SizeMod>2</SizeMod>
<Cost>50</Cost>
<Damage>15</Damage>
<Model>s0_disruptor0</Model>
<Thumbnail>s0_disruptor0</Thumbnail>
<Description>Instead of using inefficient beams, the Tesla Gun arcs electricity directly to the hull/shields of the enemy ship, and electrocutes the crew/overloads the shield generator</Description>
<Category>Beam</Category>
<Behavior>Beam</Behavior>
<Tech_Requirement>Tesla Gun</Tech_Requirement>
<Animation>tesla.X</Animation>
<FrameCount>20</FrameCount>
<LaunchFrame>0</LaunchFrame>
<ImpactFrame>1</ImpactFrame>
<AttackSound>tesla arc</AttackSound>
<ScaleWidthPercent>50</ScaleWidthPercent>
<FlavorText0>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText0>
<FlavorText1>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText1>
<FlavorText2>T-1 Electrical Arc Energy Weapon.</FlavorText2>
<FlavorText3>Kli'Kitar Electronic Death weapon.</FlavorText3>
<FlavorText4>Enemy pain screamer.</FlavorText4>
<FlavorText5>Primitive powerful energy beam.</FlavorText5>
</Weapon>
<Weapon Name="Teslagun2">
<DisplayName>Teslagun2</DisplayName>
<Class>B</Class>
<Type>4</Type>
<Size>8</Size>
<SizeMod>2</SizeMod>
<Cost>60</Cost>
<Damage>15</Damage>
<Model>s0_disruptor0</Model>
<Thumbnail>s0_disruptor0</Thumbnail>
<Description>Instead of using inefficient beams, the Tesla Gun arcs electricity directly to the hull/shields of the enemy ship, and electrocutes the crew/overloads the shield generator</Description>
<Category>Beam</Category>
<Behavior>Beam</Behavior>
<Tech_Requirement>Tesla Gun2</Tech_Requirement>
<Animation>tesla.X</Animation>
<FrameCount>20</FrameCount>
<LaunchFrame>0</LaunchFrame>
<ImpactFrame>1</ImpactFrame>
<AttackSound>tesla arc</AttackSound>
<ScaleWidthPercent>50</ScaleWidthPercent>
<FlavorText0>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText0>
<FlavorText1>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText1>
<FlavorText2>T-2 Electrical Arc Energy Weapon.</FlavorText2>
<FlavorText3>Kli'Kitar Electronic Death weapon.</FlavorText3>
<FlavorText4>Enemy pain screamer.</FlavorText4>
<FlavorText5>Primitive powerful energy beam.</FlavorText5>
</Weapon>
<Weapon Name="Teslagun3">
<DisplayName>Teslagun3</DisplayName>
<Class>B</Class>
<Type>4</Type>
<Size>6</Size>
<SizeMod>2</SizeMod>
<Cost>70</Cost>
<Damage>20</Damage>
<Model>s0_disruptor1</Model>
<Thumbnail>s0_disruptor1</Thumbnail>
<Description>Instead of using inefficient beams, the Tesla Gun arcs electricity directly to the hull/sheilds of the enemy ship, and electricutes the crew/overloads the sheild generator</Description>
<Category>Beam</Category>
<Behavior>Beam</Behavior>
<Tech_Requirement>Tesla Gun3</Tech_Requirement>
<Animation>tesla.X</Animation>
<FrameCount>20</FrameCount>
<LaunchFrame>0</LaunchFrame>
<ImpactFrame>1</ImpactFrame>
<AttackSound>tesla arc</AttackSound>
<ScaleWidthPercent>50</ScaleWidthPercent>
<FlavorText0>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText0>
<FlavorText1>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText1>
<FlavorText2>T-3 Electrical Arc Energy Weapon.</FlavorText2>
<FlavorText3>Kli'Kitar Electronic Death weapon.</FlavorText3>
<FlavorText4>Enemy pain screamer.</FlavorText4>
<FlavorText5>Primitive powerful energy beam.</FlavorText5>
</Weapon>
<Weapon Name="Teslagun4">
<DisplayName>Teslagun4</DisplayName>
<Class>B</Class>
<Type>4</Type>
<Size>4</Size>
<SizeMod>2</SizeMod>
<Cost>80</Cost>
<Damage>20</Damage>
<Model>s0_disruptor2</Model>
<Thumbnail>s0_disruptor2</Thumbnail>
<Description>Instead of using inefficient beams, the Tesla Gun arcs electricity directly to the hull/sheilds of the enemy ship, and electricutes the crew/overloads the sheild generator</Description>
<Category>Beam</Category>
<Behavior>Beam</Behavior>
<Tech_Requirement>Tesla Gun4</Tech_Requirement>
<Animation>tesla.X</Animation>
<FrameCount>20</FrameCount>
<LaunchFrame>0</LaunchFrame>
<ImpactFrame>1</ImpactFrame>
<AttackSound>tesla arc</AttackSound>
<ScaleWidthPercent>50</ScaleWidthPercent>
<FlavorText0>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText0>
<FlavorText1>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText1>
<FlavorText2>T-4 Electrical Arc Energy Weapon.</FlavorText2>
<FlavorText3>Kli'Kitar Electronic Death weapon.</FlavorText3>
<FlavorText4>Enemy pain screamer.</FlavorText4>
<FlavorText5>Primitive powerful energy beam.</FlavorText5>
</Weapon>
<Weapon Name="Teslagun5">
<DisplayName>Teslagun5</DisplayName>
<Class>B</Class>
<Type>4</Type>
<Size>2</Size>
<SizeMod>2</SizeMod>
<Cost>90</Cost>
<Damage>25</Damage>
<Model>s0_disruptor0</Model>
<Thumbnail>s0_disruptor0</Thumbnail>
<Description>Instead of using inefficient beams, the Tesla Gun arcs electricity directly to the hull/sheilds of the enemy ship, and electricutes the crew/overloads the sheild generator</Description>
<Category>Beam</Category>
<Behavior>Beam</Behavior>
<Tech_Requirement>Tesla Gun5</Tech_Requirement>
<Animation>tesla.X</Animation>
<FrameCount>20</FrameCount>
<LaunchFrame>0</LaunchFrame>
<ImpactFrame>1</ImpactFrame>
<AttackSound>tesla arc</AttackSound>
<ScaleWidthPercent>50</ScaleWidthPercent>
<FlavorText0>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText0>
<FlavorText1>Electrical arc based energy weapon. Inventor - Nicola Tesla.</FlavorText1>
<FlavorText2>T-5 Electrical Arc Energy Weapon.</FlavorText2>
<FlavorText3>Kli'Kitar Electronic Death weapon.</FlavorText3>
<FlavorText4>Enemy pain screamer.</FlavorText4>
<FlavorText5>Primitive powerful energy beam.</FlavorText5>
</Weapon>
